Fixes for 2.6 (#1677)

config/puma.rb

@@ -17,9 +17,6 @@ port        ENV.fetch("PORT") { 80 }
 #
 environment ENV.fetch("RAILS_ENV") { "development" }
 
-# Specifies the `pidfile` that Puma will use.
-pidfile ENV.fetch("PIDFILE") { "tmp/pids/server.pid" }
-
 # Specifies the number of `workers` to boot in clustered mode.
 # Workers are forked webserver processes. If using threads and workers together
 # the concurrency of the application would be max `threads` * `workers`.