Do not lock web-console in Gemfile

There is not reason to not use new versions of web-console. Update to
last version 3.7.0.

Gemfile

@@ -234,7 +234,7 @@ group :development do
   # as deployment system
   gem 'mina'
   # as debugger on error pages
-  gem 'web-console', '~> 2.0'
+  gem 'web-console'
   # as development database
   gem 'sqlite3'
 end

Gemfile.lock

@@ -83,8 +83,7 @@ GEM
       actionpack (>= 3.1)
       axlsx (>= 2.0.1)
     bcrypt (3.1.12)
-    binding_of_caller (0.8.0)
-      debug_inspector (>= 0.0.1)
+    bindex (0.6.0)
     bootstrap-sass (3.4.1)
       autoprefixer-rails (>= 5.2.1)
       sassc (>= 2.0.0)
@@ -148,7 +147,6 @@ GEM
     dalli (2.7.10)
     dante (0.2.0)
     database_cleaner (1.7.0)
-    debug_inspector (0.0.3)
     delayed_job (4.1.5)
       activesupport (>= 3.0, < 5.3)
     delayed_job_active_record (4.1.3)
@@ -584,11 +582,11 @@ GEM
     url (0.3.2)
     warden (1.2.8)
       rack (>= 2.0.6)
-    web-console (2.3.0)
-      activemodel (>= 4.0)
-      binding_of_caller (>= 0.7.2)
-      railties (>= 4.0)
-      sprockets-rails (>= 2.0, < 4.0)
+    web-console (3.7.0)
+      actionview (>= 5.0)
+      activemodel (>= 5.0)
+      bindex (>= 0.4.0)
+      railties (>= 5.0)
     webmock (3.5.1)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
@@ -698,7 +696,7 @@ DEPENDENCIES
   rspec-rails
   rubocop
   rubocop-rspec
-  ruby-oembed (~> 0.12.0)
+  ruby-oembed
   sass-rails (>= 4.0.2)
   selectize-rails
   selenium-webdriver
@@ -715,7 +713,7 @@ DEPENDENCIES
   turbolinks
   uglifier (>= 1.3.0)
   unobtrusive_flash (>= 3)
-  web-console (~> 2.0)
+  web-console
   webmock
   whenever