Merge pull request #96 from coderwall/dependabot/bundler/puma-3.12.4

Bump puma from 3.12.2 to 3.12.4

Author: usiegj00

Gemfile.lock

@@ -242,7 +242,7 @@ GEM
       websocket-driver (>= 0.2.0)
     powerpack (0.1.1)
     public_suffix (2.0.5)
-    puma (3.12.2)
+    puma (3.12.4)
     puma_worker_killer (0.1.0)
       get_process_mem (~> 0.2)
       puma (>= 2.7, < 4)