Bump jazzy from 0.11.2 to 0.12.0

Bumps [jazzy](https://github.com/realm/jazzy) from 0.11.2 to 0.12.0.
- [Release notes](https://github.com/realm/jazzy/releases)
- [Changelog](https://github.com/realm/jazzy/blob/master/CHANGELOG.md)
- [Commits](realm/jazzy@v0.11.2...v0.12.0)

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

Author: dependabot-preview[bot]

Gemfile.lock

@@ -51,14 +51,14 @@ GEM
     colorize (0.8.1)
     concurrent-ruby (1.1.5)
     escape (0.0.4)
-    ffi (1.11.1)
+    ffi (1.11.2)
     fourflusher (2.3.1)
     fuzzy_match (2.0.4)
     gh_inspector (1.1.3)
     httpclient (2.8.3)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    jazzy (0.11.2)
+    jazzy (0.12.0)
       cocoapods (~> 1.5)
       mustache (~> 1.1)
       open4
@@ -69,7 +69,7 @@ GEM
       xcinvoke (~> 0.3.0)
     json (2.2.0)
     liferaft (0.0.6)
-    minitest (5.12.2)
+    minitest (5.13.0)
     molinillo (0.6.6)
     mustache (1.1.0)
     nanaimo (0.2.6)