Gemfile in solidus_paypal_braintree-1.1.0 vs Gemfile in solidus_paypal_braintree-1.1.1

@@ -4,24 +4,21 @@
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
 branch = ENV.fetch('SOLIDUS_BRANCH', 'master')
 gem 'solidus', github: 'solidusio/solidus', branch: branch
 
-# Needed to help Bundler figure out how to resolve dependencies,
-# otherwise it takes forever to resolve them.
-# See https://github.com/bundler/bundler/issues/6677
-gem 'rails', '>0.a'
+gem 'rails', ENV.fetch('RAILS_VERSION', nil)
 
 # Provides basic authentication functionality for testing parts of your engine
 gem 'solidus_auth_devise'
 
 # Asset compilation speed
 gem 'mini_racer'
 gem 'sassc-rails', platforms: :mri
 
 gem 'bourbon'
 
-case ENV['DB']
+case ENV.fetch('DB', nil)
 when 'mysql'
   gem 'mysql2'
 when 'postgresql'
   gem 'pg'
 else