Update Gemfile.lock

docs/Gemfile.lock

@@ -10,8 +10,8 @@ GEM
       http_parser.rb (~> 0.6.0)
     eventmachine (1.2.7)
     eventmachine (1.2.7-x64-mingw32)
-    ffi (1.13.0)
-    ffi (1.13.0-x64-mingw32)
+    ffi (1.13.1)
+    ffi (1.13.1-x64-mingw32)
     forwardable-extended (2.6.0)
     http_parser.rb (0.6.0)
     i18n (1.8.3)
@@ -55,7 +55,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rexml (3.2.4)
-    rouge (3.19.0)
+    rouge (3.20.0)
     safe_yaml (1.0.5)
     sassc (2.4.0)
       ffi (~> 1.9)