Bump ruby version to 2.4.2 (#4958)

* Bump ruby version to 2.4.2

https://www.ruby-lang.org/en/news/2017/09/14/ruby-2-4-2-released/

Gemfile.lock is also updated.

TODO
- [ ] Update Dockerfile with Alpine release of ruby-2.4.2

* Revert jwt version

It seems that jwt 2.0.0 fails in some environment.
ref. https://github.com/zaru/webpush/issues/42

* Bump Ruby version on docker image

.ruby-version

@@ -1 +1 @@
-2.4.1
+2.4.2

.travis.yml

@@ -37,7 +37,7 @@ addons:
 
 rvm:
   - 2.3.4
-  - 2.4.1
+  - 2.4.2
 
 services:
   - redis-server

Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.4.1-alpine3.6
+FROM ruby:2.4.2-alpine3.6
 
 LABEL maintainer="https://github.com/tootsuite/mastodon" \
       description="A GNU Social-compatible microblogging server"

Gemfile.lock

@@ -57,33 +57,33 @@ GEM
       encryptor (~> 3.0.0)
     av (0.9.0)
       cocaine (~> 0.5.3)
-    aws-sdk (2.10.21)
-      aws-sdk-resources (= 2.10.21)
-    aws-sdk-core (2.10.21)
+    aws-sdk (2.10.46)
+      aws-sdk-resources (= 2.10.46)
+    aws-sdk-core (2.10.46)
       aws-sigv4 (~> 1.0)
       jmespath (~> 1.0)
-    aws-sdk-resources (2.10.21)
-      aws-sdk-core (= 2.10.21)
-    aws-sigv4 (1.0.1)
+    aws-sdk-resources (2.10.46)
+      aws-sdk-core (= 2.10.46)
+    aws-sigv4 (1.0.2)
     bcrypt (3.1.11)
-    better_errors (2.1.1)
+    better_errors (2.3.0)
       coderay (>= 1.0.0)
-      erubis (>= 2.6.6)
+      erubi (>= 1.0.0)
       rack (>= 0.9.0)
     binding_of_caller (0.7.2)
       debug_inspector (>= 0.0.1)
-    bootsnap (1.1.2)
+    bootsnap (1.1.3)
       msgpack (~> 1.0)
     brakeman (3.7.2)
-    browser (2.4.0)
+    browser (2.5.1)
     builder (3.2.3)
-    bullet (5.5.1)
+    bullet (5.6.1)
       activesupport (>= 3.0.0)
       uniform_notifier (~> 1.10.0)
     bundler-audit (0.6.0)
       bundler (~> 1.2)
       thor (~> 0.18)
-    capistrano (3.8.2)
+    capistrano (3.9.1)
       airbrussh (>= 1.0.0)
       i18n
       rake (>= 10.0.0)
@@ -99,9 +99,9 @@ GEM
       sshkit (~> 1.3)
     capistrano-yarn (2.0.2)
       capistrano (~> 3.0)
-    capybara (2.14.4)
+    capybara (2.15.1)
       addressable
-      mime-types (>= 1.16)
+      mini_mime (>= 0.1.3)
       nokogiri (>= 1.3.3)
       rack (>= 1.0.0)
       rack-test (>= 0.5.4)
@@ -115,7 +115,7 @@ GEM
     climate_control (0.2.0)
     cocaine (0.5.8)
       climate_control (>= 0.0.3, < 1.0)
-    coderay (1.1.1)
+    coderay (1.1.2)
     colorize (0.8.1)
     concurrent-ruby (1.0.5)
     connection_pool (2.2.1)
@@ -151,13 +151,12 @@ GEM
       thread_safe
     encryptor (3.0.0)
     erubi (1.6.1)
-    erubis (2.7.0)
     et-orbi (1.0.5)
       tzinfo
-    excon (0.58.0)
+    excon (0.59.0)
     execjs (2.7.0)
-    fabrication (2.16.2)
-    faker (1.7.3)
+    fabrication (2.16.3)
+    faker (1.8.4)
       i18n (~> 0.5)
     fast_blank (1.0.0)
     ffi (1.9.18)
@@ -194,7 +193,7 @@ GEM
       railties (>= 4.0.1)
     hamster (3.0.0)
       concurrent-ruby (~> 1.0)
-    hashdiff (0.3.5)
+    hashdiff (0.3.6)
     highline (1.7.8)
     hiredis (0.6.1)
     hkdf (0.3.0)
@@ -213,11 +212,11 @@ GEM
       colorize
       rack
     i18n (0.8.6)
-    i18n-tasks (0.9.16)
+    i18n-tasks (0.9.18)
       activesupport (>= 4.0.2)
       ast (>= 2.1.0)
       easy_translate (>= 0.5.0)
-      erubis
+      erubi
       highline (>= 1.7.3)
       i18n
       parser (>= 2.2.3.0)
@@ -231,7 +230,7 @@ GEM
     json-ld (2.1.5)
       multi_json (~> 1.12)
       rdf (~> 2.2)
-    json-ld-preloaded (2.2.1)
+    json-ld-preloaded (2.2.2)
       json-ld (~> 2.1, >= 2.1.5)
       multi_json (~> 1.11)
       rdf (~> 2.2)
@@ -258,10 +257,11 @@ GEM
       letter_opener (~> 1.0)
       railties (>= 3.2)
     link_header (0.0.8)
-    lograge (0.5.1)
+    lograge (0.6.0)
       actionpack (>= 4, < 5.2)
       activesupport (>= 4, < 5.2)
       railties (>= 4, < 5.2)
+      request_store (~> 1.0)
     loofah (2.0.3)
       nokogiri (>= 1.5.9)
     mail (2.6.6)
@@ -276,27 +276,28 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
     mimemagic (0.3.2)
+    mini_mime (0.1.4)
     mini_portile2 (2.2.0)
     minitest (5.10.3)
     msgpack (1.1.0)
-    multi_json (1.12.1)
+    multi_json (1.12.2)
     net-scp (1.2.1)
       net-ssh (>= 2.6.5)
-    net-ssh (4.1.0)
+    net-ssh (4.2.0)
     nio4r (2.1.0)
     nokogiri (1.8.0)
       mini_portile2 (~> 2.2.0)
     nokogumbo (1.4.13)
       nokogiri
-    oj (3.3.4)
-    openssl (2.0.4)
+    oj (3.3.5)
+    openssl (2.0.5)
     orm_adapter (0.5.0)
     ostatus2 (2.0.1)
       addressable (~> 2.4)
       http (~> 2.0)
       nokogiri (~> 1.6)
       openssl (~> 2.0)
-    ox (2.5.0)
+    ox (2.6.0)
     paperclip (5.1.0)
       activemodel (>= 4.2.0)
       activesupport (>= 4.2.0)
@@ -306,15 +307,15 @@ GEM
     paperclip-av-transcoder (0.6.4)
       av (~> 0.9.0)
       paperclip (>= 2.5.2)
-    parallel (1.11.2)
-    parallel_tests (2.14.2)
+    parallel (1.12.0)
+    parallel_tests (2.15.0)
       parallel
     parser (2.4.0.0)
       ast (~> 2.2)
     pg (0.21.0)
     pghero (1.7.0)
       activerecord
-    pkg-config (1.2.4)
+    pkg-config (1.2.7)
     powerpack (0.1.1)
     pry (0.10.4)
       coderay (~> 1.1.0)
@@ -371,8 +372,8 @@ GEM
       thor (>= 0.18.1, < 2.0)
     rainbow (2.2.2)
       rake
-    rake (12.0.0)
-    rdf (2.2.8)
+    rake (12.1.0)
+    rdf (2.2.9)
       hamster (~> 3.0)
       link_header (~> 0.0, >= 0.0.8)
     rdf-normalize (0.3.2)
@@ -396,6 +397,7 @@ GEM
       redis-store (>= 1.2, < 2)
     redis-store (1.3.0)
       redis (>= 2.2)
+    request_store (1.3.2)
     responders (2.4.0)
       actionpack (>= 4.2.0, < 5.3)
       railties (>= 4.2.0, < 5.3)
@@ -410,7 +412,7 @@ GEM
     rspec-mocks (3.6.0)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.6.0)
-    rspec-rails (3.6.0)
+    rspec-rails (3.6.1)
       actionpack (>= 3.0)
       activesupport (>= 3.0)
       railties (>= 3.0)
@@ -422,15 +424,15 @@ GEM
       rspec-core (~> 3.0, >= 3.0.0)
       sidekiq (>= 2.4.0)
     rspec-support (3.6.0)
-    rubocop (0.49.1)
+    rubocop (0.50.0)
       parallel (~> 1.10)
       parser (>= 2.3.3.1, < 3.0)
       powerpack (~> 0.1)
-      rainbow (>= 1.99.1, < 3.0)
+      rainbow (>= 2.2.2, < 3.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (~> 1.0, >= 1.0.1)
     ruby-oembed (0.12.0)
-    ruby-progressbar (1.8.1)
+    ruby-progressbar (1.8.3)
     rufus-scheduler (3.4.2)
       et-orbi (~> 1.0)
     safe_yaml (1.0.4)
@@ -438,7 +440,7 @@ GEM
       crass (~> 1.0.2)
       nokogiri (>= 1.4.4)
       nokogumbo (~> 1.4.1)
-    sass (3.4.24)
+    sass (3.4.25)
     scss_lint (0.54.0)
       rake (>= 0.9, < 13)
       sass (~> 3.4.20)
@@ -450,12 +452,12 @@ GEM
     sidekiq-bulk (0.1.1)
       activesupport
       sidekiq
-    sidekiq-scheduler (2.1.8)
+    sidekiq-scheduler (2.1.9)
       redis (~> 3)
       rufus-scheduler (~> 3.2)
       sidekiq (>= 3)
       tilt (>= 1.4.0)
-    sidekiq-unique-jobs (5.0.9)
+    sidekiq-unique-jobs (5.0.10)
       sidekiq (>= 4.0, <= 6.0)
       thor (~> 0)
     simple-navigation (4.0.5)
@@ -463,11 +465,11 @@ GEM
     simple_form (3.5.0)
       actionpack (> 4, < 5.2)
       activemodel (> 4, < 5.2)
-    simplecov (0.14.1)
+    simplecov (0.15.1)
       docile (~> 1.1.0)
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
-    simplecov-html (0.10.1)
+    simplecov-html (0.10.2)
     slop (3.6.0)
     sprockets (3.7.1)
       concurrent-ruby (~> 1.0)
@@ -476,7 +478,7 @@ GEM
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
-    sshkit (1.13.1)
+    sshkit (1.14.0)
       net-scp (>= 1.1.2)
       net-ssh (>= 2.8.0)
     statsd-instrument (2.1.4)
@@ -620,7 +622,7 @@ DEPENDENCIES
   webpush
 
 RUBY VERSION
-   ruby 2.4.1p111
+   ruby 2.4.2p198
 
 BUNDLED WITH
    1.15.4