Update paperclip gem

Gemfile.lock

@@ -81,7 +81,7 @@ GEM
       activesupport (>= 4.2.0)
     hashie (3.5.7)
     http_accept_language (2.1.1)
-    i18n (0.9.1)
+    i18n (0.9.5)
       concurrent-ruby (~> 1.0)
     jbuilder (2.7.0)
       activesupport (>= 4.2.0)
@@ -121,7 +121,7 @@ GEM
     mimemagic (0.3.2)
     mini_mime (1.0.0)
     mini_portile2 (2.3.0)
-    minitest (5.11.1)
+    minitest (5.11.3)
     mocha (1.3.0)
       metaclass (~> 0.0.1)
     multi_json (1.13.1)
@@ -166,7 +166,7 @@ GEM
     omniauth-twitter (1.2.1)
       json (~> 1.3)
       omniauth-oauth (~> 1.1)
-    paperclip (5.1.0)
+    paperclip (5.2.1)
       activemodel (>= 4.2.0)
       activesupport (>= 4.2.0)
       cocaine (~> 0.5.5)
@@ -254,7 +254,7 @@ GEM
     turbolinks (5.1.0)
       turbolinks-source (~> 5.1)
     turbolinks-source (5.1.0)
-    tzinfo (1.2.4)
+    tzinfo (1.2.5)
       thread_safe (~> 0.1)
     tzinfo-data (1.2017.3)
       tzinfo (>= 1.0.0)
@@ -321,7 +321,7 @@ DEPENDENCIES
   yt (~> 0.28.0)
 
 RUBY VERSION
-   ruby 2.4.2p198
+   ruby 2.4.0p0
 
 BUNDLED WITH
    1.16.1