Update Goldfinger gem to 2.0 (#4286)

- No masking of HTTP::Error and OpenSSL::SSL::SSLError
- No longer accepts non-HTTPS WebFinger endpoints

Gemfile.lock

@@ -166,10 +166,11 @@ GEM
     gemoji (3.0.0)
     globalid (0.4.0)
       activesupport (>= 4.2.0)
-    goldfinger (1.2.0)
-      addressable (~> 2.4)
-      http (~> 2.0)
-      nokogiri (~> 1.6)
+    goldfinger (2.0.0)
+      addressable (~> 2.5)
+      http (~> 2.2)
+      nokogiri (~> 1.8)
+      oj (~> 3.0)
     hamlit (2.8.4)
       temple (>= 0.8.0)
       thor
@@ -523,7 +524,7 @@ DEPENDENCIES
   fast_blank (~> 1.0)
   fuubar (~> 2.2)
   gemoji (~> 3.0)
-  goldfinger (~> 1.2)
+  goldfinger (~> 2.0)
   hamlit-rails (~> 0.2)
   hiredis (~> 0.6)
   htmlentities (~> 4.3)
@@ -591,4 +592,4 @@ RUBY VERSION
    ruby 2.4.1p111
 
 BUNDLED WITH
-   1.15.1
+   1.15.2