chore(deps): bump httparty from 0.15.7 to 0.21.0

Bumps [httparty](https://github.com/jnunemaker/httparty) from 0.15.7 to 0.21.0.
- [Release notes](https://github.com/jnunemaker/httparty/releases)
- [Changelog](https://github.com/jnunemaker/httparty/blob/master/Changelog.md)
- [Commits](jnunemaker/httparty@v0.15.7...v0.21.0)

---
updated-dependencies:
- dependency-name: httparty
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile

@@ -94,7 +94,7 @@ gem 'will_paginate', '~> 3.0'
 
 gem 'aws-sdk', '3.0.1' # DRAMATIC CHANGES
 
-gem 'httparty', '~> 0.15.1' # FROM 13 to 15 BREAKING CHANGES
+gem 'httparty', '~> 0.21.0' # FROM 13 to 15 BREAKING CHANGES
 gem 'httmultiparty', '~> 0.3.14'
 
 gem 'sidekiq', '~> 5.2.5' # DRAMATIC CHANGES

Gemfile.lock

@@ -1091,7 +1091,8 @@ GEM
       httparty (>= 0.7.3)
       mimemagic
       multipart-post
-    httparty (0.15.7)
+    httparty (0.21.0)
+      mini_mime (>= 1.0.0)
       multi_xml (>= 0.5.2)
     i18n (1.8.2)
       concurrent-ruby (~> 1.0)
@@ -1349,7 +1350,7 @@ DEPENDENCIES
   factory_girl_rails (~> 4.4.1)
   gdal (~> 2.0)
   httmultiparty (~> 0.3.14)
-  httparty (~> 0.15.1)
+  httparty (~> 0.21.0)
   jquery-rails (~> 4.3.3)
   levenshtein (~> 0.2.2)
   minitest (~> 5.10, != 5.10.2)