Merge pull request #258 from k0kubun/puma-3_11_4

bundle update puma

Author: tgxworld

Gemfile.lock

@@ -192,7 +192,7 @@ GEM
       websocket-driver (>= 0.2.0)
     powerpack (0.1.1)
     public_suffix (2.0.4)
-    puma (3.6.0)
+    puma (3.11.4)
     rack (2.0.4)
     rack-mini-profiler (0.10.1)
       rack (>= 1.2.0)