Bump paperclip from 4.2.4 to 4.3.7 (#285)

Bumps [paperclip](https://github.com/thoughtbot/paperclip) from 4.2.4 to 4.3.7.
- [Release notes](https://github.com/thoughtbot/paperclip/releases)
- [Changelog](https://github.com/thoughtbot/paperclip/blob/v4.3.7/NEWS)
- [Commits](thoughtbot/paperclip@v4.2.4...v4.3.7)

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile

@@ -19,7 +19,7 @@ group :dependencies do
   gem "open_id_authentication"
   gem "RubyInline"
   gem "coveralls", require: false
-  gem "paperclip", "~>4.2.2"
+  gem "paperclip", "~>4.3.7"
 
   # if you use amazon s3 for warpable image storage
   gem 'aws-sdk', '~> 1.5.7'

Gemfile.lock

@@ -43,7 +43,7 @@ GEM
     climate_control (0.2.0)
     cocaine (0.5.8)
       climate_control (>= 0.0.3, < 1.0)
-    concurrent-ruby (1.1.4)
+    concurrent-ruby (1.1.5)
     coveralls (0.7.1)
       multi_json (~> 1.3)
       rest-client
@@ -81,6 +81,7 @@ GEM
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
     mime-types (1.25.1)
+    mimemagic (0.3.0)
     mini_portile2 (2.4.0)
     multi_json (1.13.1)
     multi_xml (0.6.0)
@@ -95,11 +96,12 @@ GEM
       ruby-openid-apps-discovery (~> 1.2.0)
     open_id_authentication (1.3.0)
       rack-openid (~> 1.3)
-    paperclip (4.2.4)
+    paperclip (4.3.7)
       activemodel (>= 3.2.0)
       activesupport (>= 3.2.0)
       cocaine (~> 0.5.5)
       mime-types
+      mimemagic (= 0.3.0)
     passenger (6.0.2)
       rack
       rake (>= 0.8.1)
@@ -205,7 +207,7 @@ DEPENDENCIES
   mysql2 (< 0.4)
   oa-openid (= 0.3.2)
   open_id_authentication
-  paperclip (~> 4.2.2)
+  paperclip (~> 4.3.7)
   passenger
   rails (~> 3.2)
   rake (~> 12.3.2)