Upgrade web-console to 2.3.0

Rails 5 compatibility release.

See the Changelog for more information:
https://github.com/rails/web-console/releases/tag/v2.3.0

Gemfile.lock

@@ -868,7 +868,7 @@ GEM
       equalizer (~> 0.0, >= 0.0.9)
     warden (1.2.4)
       rack (>= 1.0)
-    web-console (2.2.1)
+    web-console (2.3.0)
       activemodel (>= 4.0)
       binding_of_caller (>= 0.7.2)
       railties (>= 4.0)
@@ -1064,3 +1064,6 @@ DEPENDENCIES
   web-console (~> 2.0)
   webmock (~> 1.21.0)
   wikicloth (= 0.8.1)
+
+BUNDLED WITH
+   1.11.2