Update addressable from 2.7 to 2.8

Closes: #77

Author: amirdew

Gemfile.lock

@@ -7,8 +7,8 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    addressable (2.7.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.0)
+      public_suffix (>= 2.8.0, < 5.0)
     algoliasearch (1.27.1)
       httpclient (~> 2.8, >= 2.8.3)
       json (>= 1.5.1)