Update rest-client to version 1.8.0

Gemfile.lock

@@ -67,6 +67,8 @@ GEM
       thread_safe (~> 0.1)
       warden (~> 1.2.3)
     docile (1.1.5)
+    domain_name (0.5.23)
+      unf (>= 0.0.5, < 1.0.0)
     erubis (2.7.0)
     execjs (2.4.0)
     fastercsv (1.5.5)
@@ -79,6 +81,8 @@ GEM
     haml (4.0.6)
       tilt
     hike (1.2.3)
+    http-cookie (1.0.2)
+      domain_name (~> 0.5)
     http_accept_language (2.0.5)
     i18n (0.7.0)
     jquery-rails (4.0.3)
@@ -169,7 +173,8 @@ GEM
     remotipart (1.2.1)
     responders (2.1.0)
       railties (>= 4.2.0, < 5)
-    rest-client (1.7.3)
+    rest-client (1.8.0)
+      http-cookie (>= 1.0.2, < 2.0)
       mime-types (>= 1.16, < 3.0)
       netrc (~> 0.7)
     rubocop (0.29.1)
@@ -217,6 +222,9 @@ GEM
     uglifier (2.7.1)
       execjs (>= 0.3.0)
       json (>= 1.8.0)
+    unf (0.1.4)
+      unf_ext
+    unf_ext (0.0.6)
     validates_formatting_of (0.8.1)
       activemodel (~> 4.0)
     warden (1.2.3)