README.md in rspec-graphql_matchers-0.5 vs README.md in rspec-graphql_matchers-0.6

@@ -10,10 +10,11 @@
 
 ## Usage
 
 The matchers currently supported are:
    - `expect(a_graphql_object).to have_a_field(field_name).that_returns(valid_type)`
+   - `expect(a_graphql_object).to interface(interface_name, ...)`
    - `expect(a_mutation_type).to have_a_return_field(field_name).returning(valid_type)`
    - `expect(a_mutation_type).to have_an_input_field(field_name).of_type(valid_type)`
    - `expect(a_field).to be_of_type(valid_type)`
    - `expect(an_input).to accept_arguments(hash_of_arg_names_and_valid_types)`
    - `expect(an_input).to accept_arguments(hash_of_arg_names_and_valid_types)`
@@ -31,10 +32,12 @@
 
 PostType = GraphQL::ObjectType.define do
   name "Post"
   description "A blog post"
 
+  interfaces [GraphQL::Relay::Node.interface]
+
   field :id, !types.ID
 
   field :comments, !types[types.String]
 
   field :subposts, PostType do
@@ -104,15 +107,10 @@
     it { is_expected.to be_of_type('[String]!') }
   end
 end
 ```
 
-Having to define `types` everywhere is quite annoying. If you prefer, you can
-just `include RSpec::GraphqlMatchers::TypesHelper` once 
-(for example in your `spec_helper.rb`)
-and the `types` shortcut will be available within the include context.
-
 ### 3) Test the arguments accepted by a field with `accept_arguments` matcher:
 
 ```ruby
 describe PostType do
   describe 'subposts' do
@@ -130,10 +128,24 @@
     it { is_expected.not_to accept_arguments(a_whole_bunch_of_args) }
   end
 end
 ```
 
+### 4) Test an object's interface implementations:
+
+```ruby
+describe PostType do
+  it 'interfaces Node' do
+    expect(subject).to implement('Node')
+  end
+
+  # Accepts arguments as an array and type objects directly
+  it { is_expected.to implement(GraphQL::Relay::Node.interface) }
+  it { is_expected.not_to implement('OtherInterface') }
+end
+```
+
 The spec will only pass if all attributes/types specified in the hash are
 defined on the field.
 
 For better fluency, `accept_arguments` is also available in singular form, as
 `accept_argument`.
@@ -154,8 +166,7 @@
 contributors are expected to adhere to the
 [Contributor Covenant](http://contributor-covenant.org) code of conduct.
 
 ## License
 
-The gem is available as open source under the terms of the 
+The gem is available as open source under the terms of the
 [MIT License](http://opensource.org/licenses/MIT).
-