Bump omniauth

Gemfile

@@ -156,7 +156,7 @@ gem "secure_headers", "5.0.5"
 
 # Services
 
-gem "omniauth",           "1.6.1"
+gem "omniauth",           "1.8.1"
 gem "omniauth-facebook",  "4.0.0"
 gem "omniauth-tumblr",    "1.2"
 gem "omniauth-twitter",   "1.4.0"

Gemfile.lock

@@ -291,7 +291,7 @@ GEM
       sprockets (>= 2.0.0)
       tilt (>= 1.2)
     hashdiff (0.3.6)
-    hashie (3.5.6)
+    hashie (3.5.7)
     hitimes (1.2.6)
     http (2.2.2)
       addressable (~> 2.3)
@@ -406,7 +406,7 @@ GEM
       rack (>= 1.2, < 3)
     octokit (4.7.0)
       sawyer (~> 0.8.0, >= 0.5.3)
-    omniauth (1.6.1)
+    omniauth (1.8.1)
       hashie (>= 3.4.6, < 3.6.0)
       rack (>= 1.6.2, < 3)
     omniauth-facebook (4.0.0)
@@ -825,7 +825,7 @@ DEPENDENCIES
   mobile-fu (= 1.4.0)
   mysql2 (= 0.5.0)
   nokogiri (= 1.8.2)
-  omniauth (= 1.6.1)
+  omniauth (= 1.8.1)
   omniauth-facebook (= 4.0.0)
   omniauth-tumblr (= 1.2)
   omniauth-twitter (= 1.4.0)