change to newer puma version

Gemfile

@@ -52,7 +52,7 @@ gem 'sassc-rails'
 
 gem 'uglifier', '>= 1.0.3'
 
-gem 'unicorn', '~> 5.1'
+gem 'puma'
 
 gem 'rack-piwik', '~> 0.3.0', require: 'rack/piwik'
 

Gemfile.lock

@@ -232,7 +232,6 @@ GEM
     jquery-ui-rails (6.0.1)
       railties (>= 3.2.16)
     jsonapi-renderer (0.2.2)
-    kgio (2.11.4)
     launchy (2.5.2)
       addressable (~> 2.8)
     letter_opener (1.8.1)
@@ -304,6 +303,8 @@ GEM
       method_source (~> 1.0)
     psych (3.3.3)
     public_suffix (5.0.1)
+    puma (6.4.2)
+      nio4r (~> 2.0)
     racc (1.7.1)
     rack (2.2.6.4)
     rack-attack (6.7.0)
@@ -343,7 +344,6 @@ GEM
       rake (>= 12.2)
       thor (~> 1.0)
     rainbow (3.1.1)
-    raindrops (0.20.1)
     rake (13.0.6)
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
@@ -424,9 +424,6 @@ GEM
       execjs (>= 0.3.0, < 3)
     unaccent (0.4.0)
     unicode-display_width (1.4.1)
-    unicorn (5.8.0)
-      kgio (~> 2.6)
-      raindrops (~> 0.7)
     uniform_notifier (1.16.0)
     warden (1.2.9)
       rack (>= 2.0.9)
@@ -485,6 +482,7 @@ DEPENDENCIES
   poltergeist (= 1.18.1)
   pry
   psych (< 4.0)
+  puma
   rack-attack
   rack-piwik (~> 0.3.0)
   rack-timeout
@@ -499,7 +497,6 @@ DEPENDENCIES
   simple_form
   stackprof
   uglifier (>= 1.0.3)
-  unicorn (~> 5.1)
   webrick (~> 1.7)
 
 RUBY VERSION

Procfile

@@ -1 +1 @@
-web: bundle exec unicorn -p $PORT -c ./config/unicorn.rb
+web: bundle exec puma -C config/puma.rb

config/puma.rb

@@ -0,0 +1,9 @@
+workers Integer(ENV['WEB_CONCURRENCY'] || 1)
+threads_count = Integer(ENV['RAILS_MAX_THREADS'] || 5)
+threads threads_count, threads_count
+
+preload_app!
+
+rackup      DefaultRackup if defined?(DefaultRackup)
+port        ENV['PORT']     || 3000
+environment ENV['RACK_ENV'] || 'development'