Merge pull request #20 from BookOfGreg/dependabot/bundler/puma-3.12.4

Bump puma from 3.12.2 to 3.12.4

Author: BookOfGreg

Gemfile.lock

@@ -95,7 +95,7 @@ GEM
     nokogiri (1.10.8)
       mini_portile2 (~> 2.4.0)
     public_suffix (3.0.3)
-    puma (3.12.2)
+    puma (3.12.4)
     rack (2.0.8)
     rack-proxy (0.6.5)
       rack