Bump skylight from 1.4.2 to 1.5.0

Bumps [skylight](https://github.com/skylightio/skylight-ruby) from 1.4.2 to 1.5.0.
- [Changelog](https://github.com/skylightio/skylight-ruby/blob/master/CHANGELOG.md)
- [Commits](skylightio/skylight-ruby@v1.4.2...v1.5.0)

Gemfile.lock

@@ -179,7 +179,7 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
     mini_portile2 (2.3.0)
-    minitest (5.10.3)
+    minitest (5.11.1)
     morpher (0.2.6)
       abstract_type (~> 0.0.7)
       adamantium (~> 0.2.0)
@@ -389,7 +389,7 @@ GEM
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
-    skylight (1.4.2)
+    skylight (1.5.0)
       activesupport (>= 3.0.0)
     slop (3.6.0)
     spring (2.0.2)