Bump jazzy from 0.13.3 to 0.13.4 (#47)

Bumps [jazzy](https://github.com/realm/jazzy) from 0.13.3 to 0.13.4.
- [Release notes](https://github.com/realm/jazzy/releases)
- [Changelog](https://github.com/realm/jazzy/blob/master/CHANGELOG.md)
- [Commits](realm/jazzy@v0.13.3...v0.13.4)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Gemfile.lock

@@ -130,7 +130,7 @@ GEM
       xcodeproj (>= 1.13.0, < 2.0.0)
       xcpretty (~> 0.3.0)
       xcpretty-travis-formatter (>= 0.0.3)
-    ffi (1.12.2)
+    ffi (1.13.0)
     fourflusher (2.3.1)
     fuzzy_match (2.0.4)
     gh_inspector (1.1.3)
@@ -168,7 +168,7 @@ GEM
     httpclient (2.8.3)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    jazzy (0.13.3)
+    jazzy (0.13.4)
       cocoapods (~> 1.5)
       mustache (~> 1.1)
       open4