Fix rubocop errors

Author: Alex Evanczuk

lib/packwerk/architecture/package.rb

@@ -35,7 +35,7 @@ def from(package, layers)
           config = package.config
 
           # This allows the layer to be inferred based on the package root
-          package_root = package.name.split("/").first
+          package_root = package.name.split('/').first
           if package_root && layers.names.include?(package_root)
             layer = package_root
           else

lib/packwerk/architecture/validator.rb

@@ -15,7 +15,7 @@ def call(package_set, configuration)
 
         package_set.each do |package|
           config = package.config
-          f = Pathname.new(package.name).join("package.yml").to_s
+          f = Pathname.new(package.name).join('package.yml').to_s
           next if !config
 
           result = check_enforce_architecture_setting(f, config['enforce_architecture'])

test/unit/architecture/checker_test.rb

@@ -71,7 +71,6 @@ def utility_pack(enforce: false)
         assert checker.invalid_reference?(reference)
       end
 
-
       test 'is not an invalid reference if destination pack is below source package' do
         checker = architecture_checker
         reference = build_reference(