Upgrade Paperclip to 5.2.1 for security reasons

Gemfile

@@ -33,7 +33,7 @@ gem 'omniauth', '~> 1.8.1'
 gem 'omniauth-facebook', '~> 4.0.0'
 gem 'omniauth-google-oauth2', '~> 0.4.0'
 gem 'omniauth-twitter', '~> 1.4.0'
-gem 'paperclip', '~> 5.1.0'
+gem 'paperclip', '~> 5.2.1'
 gem 'paranoia', '~> 2.4.0'
 gem 'pg', '~> 0.21.0'
 gem 'pg_search', '~> 2.0.1'

Gemfile.lock

@@ -294,7 +294,7 @@ GEM
       omniauth-oauth (~> 1.1)
       rack
     orm_adapter (0.5.0)
-    paperclip (5.1.0)
+    paperclip (5.2.1)
       activemodel (>= 4.2.0)
       activesupport (>= 4.2.0)
       cocaine (~> 0.5.5)
@@ -539,7 +539,7 @@ DEPENDENCIES
   omniauth-facebook (~> 4.0.0)
   omniauth-google-oauth2 (~> 0.4.0)
   omniauth-twitter (~> 1.4.0)
-  paperclip (~> 5.1.0)
+  paperclip (~> 5.2.1)
   paranoia (~> 2.4.0)
   pg (~> 0.21.0)
   pg_search (~> 2.0.1)