Bump skylight from 2.0.2 to 3.1.4 (#1959)

Bumps [skylight](https://github.com/skylightio/skylight-ruby) from 2.0.2 to 3.1.4.
- [Release notes](https://github.com/skylightio/skylight-ruby/releases)
- [Changelog](https://github.com/skylightio/skylight-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/skylightio/skylight-ruby/compare/v2.0.2...v3.1.4)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Gemfile

@@ -88,7 +88,7 @@ gem "sdoc", "~> 1.0", group: :doc
 gem "serviceworker-rails", "~> 0.5"
 gem "share_meow_client", "~> 0.1"
 gem "sitemap_generator", "~> 6.0"
-gem "skylight", "~> 2.0"
+gem "skylight", "~> 3.1"
 gem "slack-notifier", "~> 2.3"
 gem "sprockets", "~> 3.7"
 gem "staccato", "~> 0.5"

Gemfile.lock

@@ -536,7 +536,7 @@ GEM
       mime-types (~> 3.0)
       multi_xml (>= 0.5.2)
     httpclient (2.8.3)
-    i18n (1.5.3)
+    i18n (1.6.0)
       concurrent-ruby (~> 1.0)
     ice_nine (0.11.2)
     inflecto (0.0.2)
@@ -843,9 +843,9 @@ GEM
       tilt (~> 2.0)
     sitemap_generator (6.0.2)
       builder (~> 3.0)
-    skylight (2.0.2)
-      skylight-core (= 2.0.2)
-    skylight-core (2.0.2)
+    skylight (3.1.4)
+      skylight-core (= 3.1.4)
+    skylight-core (3.1.4)
       activesupport (>= 4.2.0)
     slack-notifier (2.3.2)
     smart_properties (1.13.1)
@@ -1057,7 +1057,7 @@ DEPENDENCIES
   simplecov (~> 0.16)
   sinatra (~> 2.0)
   sitemap_generator (~> 6.0)
-  skylight (~> 2.0)
+  skylight (~> 3.1)
   slack-notifier (~> 2.3)
   spring (~> 2.0)
   spring-commands-rspec (~> 1.0)