[260] Fixed bug with uniq type

[VoronoyAlexandr]

Description (*)

PR fixed bug "Schema must contain unique named types but contains multiple types named 'Recipient'"

Fixed Issues (if relevant)

#260: [BUG] Schema must contain unique named types but contains multiple types named "Recipient"

Manual testing scenarios (*)

Queries for testing

mutation {
    sendEmailToFriend(
        input: {
          product_id: 3	
          sender: {
            name: "Name"
            email: "[email protected]"
           message: "Lorem Ipsum"
        }          
          recipients: [
              {
                  name: "Recipient Name 1"
                  email:"[email protected]"
               },
              {
                  name: "Recipient Name 2"
                  email:"[email protected]"
              }
          ]
        } 
    ) {
        sender {
            name
            email
            message
        }
        recipients {
            name
             email
        }
    }
}

end

query IntrospectionQuery {
    __schema {
      queryType { name }
      mutationType { name }
      types {
        ...FullType
      }
      directives {
        name
        description
        locations
        args {
          ...InputValue
        }
      }
    }
  }

  fragment FullType on __Type {
    kind
    name
    description
    fields(includeDeprecated: true) {
      name
      description
      args {
        ...InputValue
      }
      type {
        ...TypeRef
      }
      isDeprecated
      deprecationReason
    }
    inputFields {
      ...InputValue
    }
    interfaces {
      ...TypeRef
    }
    enumValues(includeDeprecated: true) {
      name
      description
      isDeprecated
      deprecationReason
    }
    possibleTypes {
      ...TypeRef
    }
  }

  fragment InputValue on __InputValue {
    name
    description
    type { ...TypeRef }
    defaultValue
  }

  fragment TypeRef on __Type {
    kind
    name
    ofType {
      kind
      name
      ofType {
        kind
        name
        ofType {
          kind
          name
          ofType {
            kind
            name
            ofType {
              kind
              name
              ofType {
                kind
                name
                ofType {
                  kind
                  name
                }
              }
            }
          }
        }
      }
    }
  }

and others done without errors.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)