update slack-api gem to 1.5

Gemfile

@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem 'slack-api', :github => 'tyage/slack-ruby-gem'
+gem 'slack-api'
 gem 'sinatra'
 gem 'rubyzip'
 gem 'mongo'

Gemfile.lock

@@ -1,13 +1,3 @@
-GIT
- remote: git:https://github.com/tyage/slack-ruby-gem.git
- revision: 133311705ef1b2698a05e6af3c7180d99c2ecd28
- specs:
- slack-api (1.2.0)
- faraday (>= 0.7, < 0.10)
- faraday_middleware (~> 0.8)
- faye-websocket (~> 0.9.2)
- multi_json (~> 1.0, >= 1.0.3)
-
 GEM
  remote: https://rubygems.org/
  specs:
@@ -30,19 +20,19 @@ GEM
  celluloid-supervision (0.20.5)
  timers (>= 4.1.1)
  connection_pool (2.2.0)
- eventmachine (1.0.8)
- faraday (0.9.2)
+ eventmachine (1.2.3)
+ faraday (0.12.1)
  multipart-post (>= 1.2, < 3)
- faraday_middleware (0.10.0)
- faraday (>= 0.7.4, < 0.10)
- faye-websocket (0.9.2)
+ faraday_middleware (0.10.1)
+ faraday (>= 0.7.4, < 1.0)
+ faye-websocket (0.10.7)
  eventmachine (>= 0.12.0)
  websocket-driver (>= 0.5.1)
  hitimes (1.2.3)
  json (1.8.6)
  mongo (2.1.2)
  bson (~> 3.0)
- multi_json (1.11.2)
+ multi_json (1.12.1)
  multipart-post (2.0.0)
  rack (1.6.4)
  rack-protection (1.5.3)
@@ -61,10 +51,15 @@ GEM
  rack (~> 1.4)
  rack-protection (~> 1.4)
  tilt (>= 1.3, < 3)
+ slack-api (1.5.0)
+ faraday (~> 0.11)
+ faraday_middleware (~> 0.10.0)
+ faye-websocket (~> 0.10.6)
+ multi_json (~> 1.0, >= 1.0.3)
  tilt (2.0.1)
  timers (4.1.1)
  hitimes
- websocket-driver (0.6.3)
+ websocket-driver (0.6.5)
  websocket-extensions (>= 0.1.0)
  websocket-extensions (0.1.2)
 
@@ -77,7 +72,7 @@ DEPENDENCIES
  rubyzip
  sidekiq
  sinatra
- slack-api!
+ slack-api
 
 BUNDLED WITH
  1.14.6