Bump sinatra from 2.0.0 to 2.0.2 in /service_broker

Bumps [sinatra](https://github.com/sinatra/sinatra) from 2.0.0 to 2.0.2.
- [Release notes](https://github.com/sinatra/sinatra/releases)
- [Changelog](https://github.com/sinatra/sinatra/blob/master/CHANGELOG.md)
- [Commits](sinatra/sinatra@v2.0.0...v2.0.2)

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

Author: dependabot[bot]

service_broker/Gemfile.lock

@@ -16,30 +16,32 @@ GEM
     mocha (1.3.0)
       metaclass (~> 0.0.1)
     multipart-post (2.0.0)
-    mustermann (1.0.1)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
     octokit (4.7.0)
       sawyer (~> 0.8.0, >= 0.5.3)
     pry (0.11.1)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (3.0.0)
     rack (2.2.3)
-    rack-protection (2.0.0)
+    rack-protection (2.0.2)
       rack
     rack-test (0.7.0)
       rack (>= 1.0, < 3)
     rake (12.3.3)
+    ruby2_keywords (0.0.4)
     safe_yaml (1.0.4)
     sawyer (0.8.1)
       addressable (>= 2.3.5, < 2.6)
       faraday (~> 0.8, < 1.0)
-    sinatra (2.0.0)
+    sinatra (2.0.2)
       mustermann (~> 1.0)
       rack (~> 2.0)
-      rack-protection (= 2.0.0)
+      rack-protection (= 2.0.2)
       tilt (~> 2.0)
     sshkey (1.9.0)
-    tilt (2.0.8)
+    tilt (2.0.10)
     webmock (3.0.1)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)