Update gem version and dependency versions

Gemfile.lock

@@ -1,9 +1,9 @@
 PATH
   remote: .
   specs:
-    omniauth-bitly (0.0.7)
+    omniauth-bitly (0.0.8)
       multi_json (~> 1.3)
-      omniauth-oauth2 (~> 1.3.0)
+      omniauth-oauth2 (~> 1.6.0)
 
 GEM
   remote: http://rubygems.org/
@@ -14,27 +14,27 @@ GEM
       safe_yaml (~> 1.0.0)
     diff-lcs (1.3)
     docile (1.3.1)
-    faraday (0.15.4)
+    faraday (0.17.1)
       multipart-post (>= 1.2, < 3)
     hashdiff (0.3.9)
     hashie (3.6.0)
     json (2.2.0)
-    jwt (2.1.0)
-    multi_json (1.13.1)
+    jwt (2.2.1)
+    multi_json (1.14.1)
     multi_xml (0.6.0)
     multipart-post (2.1.1)
-    oauth2 (1.4.1)
-      faraday (>= 0.8, < 0.16.0)
+    oauth2 (1.4.2)
+      faraday (>= 0.8, < 2.0)
       jwt (>= 1.0, < 3.0)
       multi_json (~> 1.3)
       multi_xml (~> 0.5)
       rack (>= 1.2, < 3)
     omniauth (1.9.0)
       hashie (>= 3.4.6, < 3.7.0)
       rack (>= 1.6.2, < 3)
-    omniauth-oauth2 (1.3.1)
-      oauth2 (~> 1.0)
-      omniauth (~> 1.2)
+    omniauth-oauth2 (1.6.0)
+      oauth2 (~> 1.1)
+      omniauth (~> 1.9)
     public_suffix (3.0.3)
     rack (2.0.7)
     rack-test (1.1.0)

omniauth-bitly.gemspec

@@ -19,7 +19,7 @@ Gem::Specification.new do |s|
   s.require_paths = ["lib"]
 
   s.add_dependency 'multi_json', '~> 1.3'
-  s.add_runtime_dependency 'omniauth-oauth2', '~> 1.3.0'
+  s.add_runtime_dependency 'omniauth-oauth2', '~> 1.6.0'
   s.add_development_dependency 'rspec', '~> 2.7'
   s.add_development_dependency 'rack-test'
   s.add_development_dependency 'simplecov'