Bump slather from 2.8.1 to 2.8.2

Bumps [slather](https://github.com/SlatherOrg/slather) from 2.8.1 to 2.8.2.
- [Release notes](https://github.com/SlatherOrg/slather/releases)
- [Changelog](https://github.com/SlatherOrg/slather/blob/master/CHANGELOG.md)
- [Commits](SlatherOrg/slather@v2.8.1...v2.8.2)

---
updated-dependencies:
- dependency-name: slather
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -219,7 +219,7 @@ GEM
       base64
     mini_magick (4.12.0)
     mini_mime (1.1.5)
-    minitest (5.23.1)
+    minitest (5.24.0)
     molinillo (0.8.0)
     multi_json (1.15.0)
     multipart-post (2.4.0)
@@ -267,7 +267,7 @@ GEM
     simctl (1.6.10)
       CFPropertyList
       naturally
-    slather (2.8.1)
+    slather (2.8.2)
       CFPropertyList (>= 2.2, < 4)
       activesupport
       clamp (~> 1.3)