Bump puma from 3.12.2 to 3.12.4

dependabot[bot] · web-flow · commit ad68ef41234b · 2020-03-04T02:21:29.000Z
Bumps [puma](https://github.com/puma/puma) from 3.12.2 to 3.12.4. - [Release notes](https://github.com/puma/puma/releases) - [Changelog](https://github.com/puma/puma/blob/master/History.md) - [Commits](puma/puma@v3.12.2...v3.12.4) Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/Gemfile.lock b/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)
