fix puma issue really for chrome

Gemfile

@@ -8,14 +8,7 @@ gem 'rails', '~> 5.2.0'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3', '~> 1.3', '< 1.4'
 # Use Puma as the app server
-# TODO remove once released
-# https://github.com/puma/puma/issues/1670
-# https://github.com/puma/puma/issues/1758
-if ENV['PUMA_SSL_FIX'].to_i == 1
-gem 'puma', git: 'https://github.com/puma/puma', ref: '27a09c4e7c0e04bc25a515388b6b8a55fa332ad5'
-else
-gem 'puma', '~> 3.11'
-end
+gem 'puma', '~> 4.0'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets

Gemfile.lock

@@ -130,7 +130,8 @@ GEM
     parser (2.6.3.0)
       ast (~> 2.4.0)
     public_suffix (3.0.3)
-    puma (3.12.1)
+    puma (4.0.1)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -243,7 +244,7 @@ DEPENDENCIES
   i18n-tasks
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
-  puma (~> 3.11)
+  puma (~> 4.0)
   rails (~> 5.2.0)
   rest-client
   rotp