Update gems (elixirschool#1360)

Gemfile.lock

@@ -1,8 +1,8 @@
 GEM
  remote: https://rubygems.org/
  specs:
- addressable (2.5.1)
- public_suffix (~> 2.0, >= 2.0.2)
+ addressable (2.5.2)
+ public_suffix (>= 2.0.2, < 4.0)
  autoprefixer-rails (7.1.2.3)
  execjs
  babel-source (5.8.35)
@@ -11,22 +11,31 @@ GEM
  execjs (~> 2.0)
  colorator (1.1.0)
  concurrent-ruby (1.0.5)
+ em-websocket (0.5.1)
+ eventmachine (>= 0.12.9)
+ http_parser.rb (~> 0.6.0)
+ eventmachine (1.2.5)
  execjs (2.7.0)
  extras (0.3.0)
  forwardable-extended (~> 2.5)
  fastimage (2.1.0)
- ffi (1.9.18)
+ ffi (1.9.23)
  forwardable-extended (2.6.0)
- jekyll (3.5.1)
+ http_parser.rb (0.6.0)
+ i18n (0.9.5)
+ concurrent-ruby (~> 1.0)
+ jekyll (3.7.3)
  addressable (~> 2.4)
  colorator (~> 1.0)
+ em-websocket (~> 0.5)
+ i18n (~> 0.7)
  jekyll-sass-converter (~> 1.0)
- jekyll-watch (~> 1.1)
- kramdown (~> 1.3)
+ jekyll-watch (~> 2.0)
+ kramdown (~> 1.14)
  liquid (~> 4.0)
  mercenary (~> 0.3.3)
  pathutil (~> 0.9)
- rouge (~> 1.7)
+ rouge (>= 2, < 4)
  safe_yaml (~> 1.0)
  jekyll-assets (2.3.2)
  concurrent-ruby (~> 1.0)
@@ -38,34 +47,36 @@ GEM
  sprockets (~> 3.3, < 3.8)
  jekyll-redirect-from (0.12.1)
  jekyll (~> 3.3)
- jekyll-sass-converter (1.5.0)
+ jekyll-sass-converter (1.5.2)
  sass (~> 3.4)
  jekyll-sitemap (1.1.1)
  jekyll (~> 3.3)
- jekyll-watch (1.5.0)
- listen (~> 3.0, < 3.1)
- kramdown (1.14.0)
+ jekyll-watch (2.0.0)
+ listen (~> 3.0)
+ kramdown (1.16.2)
  liquid (4.0.0)
- listen (3.0.8)
+ listen (3.1.5)
  rb-fsevent (~> 0.9, >= 0.9.4)
  rb-inotify (~> 0.9, >= 0.9.7)
+ ruby_dep (~> 1.2)
  mercenary (0.3.6)
- pathutil (0.14.0)
+ pathutil (0.16.1)
  forwardable-extended (~> 2.6)
- public_suffix (2.0.5)
+ public_suffix (3.0.2)
  puma (3.9.1)
  rack (1.6.8)
  rack-jekyll (0.5.0)
  jekyll (>= 1.3)
  listen (>= 1.3)
  rack (~> 1.5)
  rake (12.0.0)
- rb-fsevent (0.10.2)
+ rb-fsevent (0.10.3)
  rb-inotify (0.9.10)
  ffi (>= 0.5.0, < 2)
- rouge (1.11.1)
+ rouge (3.1.1)
+ ruby_dep (1.5.0)
  safe_yaml (1.0.4)
- sass (3.5.1)
+ sass (3.5.5)
  sass-listen (~> 4.0.0)
  sass-listen (4.0.0)
  rb-fsevent (~> 0.9, >= 0.9.4)
@@ -100,4 +111,4 @@ RUBY VERSION
  ruby 2.3.1p112
 
 BUNDLED WITH
- 1.15.4
+ 1.16.1