Fix linter issues (#99)

Author: Jesterovskiy

redis-session-store.gemspec

@@ -16,8 +16,8 @@ Gem::Specification.new do |gem|
   gem.version = File.read('lib/redis-session-store.rb')
                     .match(/^  VERSION = '(.*)'/)[1]
 
-  gem.add_runtime_dependency 'redis', '~> 3'
   gem.add_runtime_dependency 'actionpack', '>= 3', '< 5.2'
+  gem.add_runtime_dependency 'redis', '~> 3'
 
   gem.add_development_dependency 'fakeredis', '~> 0.5'
   gem.add_development_dependency 'rake', '~> 11'

spec/redis_session_store_spec.rb

@@ -496,7 +496,7 @@ def self.dump(_value)
       end
 
       context 'when callable' do
-        let(:options) { { :"#{h}" => ->(*) { !nil } } }
+        let(:options) { { :"#{h}" => ->(*) { true } } }
 
         it 'does not explode at init' do
           expect { store }.to_not raise_error