revert PR 35 (#42)

Revert changes made in #35.

Fixes #36. A key arg will no longer satisfy a contract specifying keyrest args.

lib/sinject/container.rb

@@ -163,7 +163,7 @@ def validate_contract(dependency_class, contract_class)
     def match?(contract, dependency)
       return true if contract[:type] == dependency[:type]
       return true if contract[:type] == :req && dependency[:type] == :opt
-      return true if [:keyreq, :keyrest].include?(contract[:type]) && dependency[:type] == :key
+      return true if contract[:type] == :keyreq && dependency[:type] == :key
 
       false
     end

spec/sinject/container_spec.rb

@@ -333,9 +333,6 @@ def with_kwrest_args(foo, bar:, kwargs:); end
 
         context 'and the class specifies an optional keyword param of the same name' do
           it 'raises DependencyContractInvalidParametersException' do
-            pending('Bug: If the contract specifies keyrest params, '\
-                    'the class should pass validation only if it also specifies keyrest args')
-
             klass = Class.new do
               def with_kwrest_args(foo, bar:, kwargs: nil); end
             end