Bump sinatra from 2.0.5 to 2.2.0

Bumps [sinatra](https://github.com/sinatra/sinatra) from 2.0.5 to 2.2.0.
- [Release notes](https://github.com/sinatra/sinatra/releases)
- [Changelog](https://github.com/sinatra/sinatra/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sinatra/sinatra/compare/v2.0.5...v2.2.0)

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

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

Gemfile

@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem 'sinatra', '2.0.5'
+gem 'sinatra', '2.2.0'
 gem 'redis'
 gem 'redis-namespace'
 gem 'sequel'

Gemfile.lock

@@ -160,7 +160,8 @@ GEM
     msgpack (1.3.1)
     multi_json (1.13.1)
     multipart-post (2.1.1)
-    mustermann (1.0.3)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
     net-scp (2.0.0)
       net-ssh (>= 2.6.5, < 6.0.0)
     net-ssh (5.2.0)
@@ -190,7 +191,7 @@ GEM
     rack (2.2.3)
     rack-cache (1.9.0)
       rack (>= 0.4)
-    rack-protection (2.0.5)
+    rack-protection (2.2.0)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -213,6 +214,7 @@ GEM
     rinku (2.0.6)
     rmagick (4.1.2)
     ruby-progressbar (1.10.1)
+    ruby2_keywords (0.0.5)
     rye (0.9.13)
       annoy
       docile (>= 1.0.1)
@@ -248,10 +250,10 @@ GEM
     simplecov-html (0.10.2)
     simpleidn (0.1.1)
       unf (~> 0.1.4)
-    sinatra (2.0.5)
+    sinatra (2.2.0)
       mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.5)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
       tilt (~> 2.0)
     sinatra-flash (0.3.0)
       sinatra (>= 1.0.0)
@@ -362,7 +364,7 @@ DEPENDENCIES
   sidekiq (~> 5.2.0)
   simplecov
   simpleidn
-  sinatra (= 2.0.5)
+  sinatra (= 2.2.0)
   sinatra-flash
   sinatra-xsendfile
   stripe (~> 5.17.0)