Use slack-ruby-bot 0.2.0.

Gemfile

@@ -2,7 +2,7 @@ source 'http://rubygems.org'
 
 ruby '2.1.6'
 
-gem 'slack-ruby-bot', github: 'dblock/slack-ruby-bot'
+gem 'slack-ruby-bot', '~> 0.2.0'
 gem 'puma'
 gem 'sinatra'
 gem 'dentaku'

Gemfile.lock

@@ -1,14 +1,3 @@
-GIT
-  remote: git://github.com/dblock/slack-ruby-bot.git
-  revision: 22f150f027d15c1a195692db0decf6bb4c850b7d
-  specs:
-    slack-ruby-bot (0.2.0)
-      activesupport
-      giphy (~> 2.0.2)
-      hashie
-      slack-api (~> 1.1.6)
-      websocket-driver (~> 0.5.4)
-
 GEM
   remote: http://rubygems.org/
   specs:
@@ -96,6 +85,12 @@ GEM
       faraday_middleware (~> 0.8)
       faye-websocket (~> 0.9.2)
       multi_json (~> 1.0, >= 1.0.3)
+    slack-ruby-bot (0.2.0)
+      activesupport
+      giphy (~> 2.0.2)
+      hashie
+      slack-api (~> 1.1.6)
+      websocket-driver (~> 0.5.4)
     thor (0.19.1)
     thread_safe (0.3.5)
     tilt (2.0.1)
@@ -121,6 +116,6 @@ DEPENDENCIES
   rspec
   rubocop (= 0.31.0)
   sinatra
-  slack-ruby-bot!
+  slack-ruby-bot (~> 0.2.0)
   vcr
   webmock