Bump sinatra from 1.4.2 to 2.2.0

Bumps [sinatra](https://github.com/sinatra/sinatra) from 1.4.2 to 2.2.0.
- [Release notes](https://github.com/sinatra/sinatra/releases)
- [Changelog](https://github.com/sinatra/sinatra/blob/master/CHANGELOG.md)
- [Commits](sinatra/sinatra@1.4.2...v2.2.0)

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

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

Gemfile.lock

@@ -27,8 +27,10 @@ GEM
       mongo_ext (>= 0.18.2)
       rack (>= 1.0.1)
     multi_json (1.7.2)
-    rack (1.5.2)
-    rack-protection (1.5.0)
+    mustermann (1.1.2)
+      ruby2_keywords (~> 0.0.1)
+    rack (2.2.4)
+    rack-protection (2.2.0)
       rack
     rake (10.0.4)
     rspec (2.13.0)
@@ -39,15 +41,17 @@ GEM
     rspec-expectations (2.13.0)
       diff-lcs (>= 1.1.3, < 2.0)
     rspec-mocks (2.13.1)
+    ruby2_keywords (0.0.5)
     simplecov (0.7.1)
       multi_json (~> 1.0)
       simplecov-html (~> 0.7.1)
     simplecov-html (0.7.1)
-    sinatra (1.4.2)
-      rack (~> 1.5, >= 1.5.2)
-      rack-protection (~> 1.4)
-      tilt (~> 1.3, >= 1.3.4)
-    tilt (1.3.7)
+    sinatra (2.2.0)
+      mustermann (~> 1.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
+      tilt (~> 2.0)
+    tilt (2.0.11)
     will_paginate (3.0.4)
 
 PLATFORMS