Merge pull request #17 from slack-ruby/dependabot/bundler/tzinfo-1.2.10

Bump tzinfo from 1.2.9 to 1.2.10

Author: dblock

Gemfile.lock

@@ -208,7 +208,7 @@ GEM
       rest-client (>= 1.4, < 4.0)
     thread_safe (0.3.6)
     timers (4.3.0)
-    tzinfo (1.2.9)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     uber (0.1.0)
     unf (0.1.4)