Bump danger from 8.3.1 to 8.4.0 (#32)

Bumps [danger](https://github.com/danger/danger) from 8.3.1 to 8.4.0.
- [Release notes](https://github.com/danger/danger/releases)
- [Changelog](https://github.com/danger/danger/blob/master/CHANGELOG.md)
- [Commits](danger/danger@8.3.1...v8.4.0)

---
updated-dependencies:
- dependency-name: danger
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile

@@ -5,7 +5,7 @@ gem 'cocoapods', '~> 1.11'
 # ------------
 # Danger Setup
 # ------------
-gem 'danger', '~> 8.0'
+gem 'danger', '~> 8.4'
 
 # general
 gem 'danger-prose'

Gemfile.lock

@@ -60,7 +60,7 @@ GEM
     concurrent-ruby (1.1.9)
     cork (0.3.0)
       colored2 (~> 3.1)
-    danger (8.3.1)
+    danger (8.4.0)
       claide (~> 1.0)
       claide-plugins (>= 0.9.2)
       colored2 (~> 3.1)
@@ -159,7 +159,7 @@ PLATFORMS
 
 DEPENDENCIES
   cocoapods (~> 1.11)
-  danger (~> 8.0)
+  danger (~> 8.4)
   danger-prose
   danger-swiftlint