[Security] Bump rack from 2.0.7 to 2.0.8 (home-assistant#11494)

dependabot-preview[bot] · frenck · commit 8df76d7fb1d6 · 2019-12-25T16:18:58.000+01:00
Bumps [rack](https://github.com/rack/rack) from 2.0.7 to 2.0.8. **This update includes a security fix.** - [Release notes](https://github.com/rack/rack/releases) - [Changelog](https://github.com/rack/rack/blob/master/CHANGELOG.md) - [Commits](rack/rack@2.0.7...2.0.8) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> Co-authored-by: null <27856297+dependabot-preview[bot]@users.noreply.github.com>
diff --git a/Gemfile.lock b/Gemfile.lock
@@ -78,7 +78,7 @@ GEM
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.1)
-    rack (2.0.7)
+    rack (2.0.8)
     rack-protection (2.0.7)
       rack
     rake (13.0.1)
