Drop the unexistent domain#reset_domain_token method

See dnsimple/dnsimple-developer#187 and
https://github.com/dnsimple/dnsimple-app/pull/14061

We dropped the method from the API but we didn't remove it from some
clients. This commit drops this unexistent method.

lib/dnsimple/client/domains.rb

@@ -114,24 +114,6 @@ def delete_domain(account_id, domain_id, options = {})
 
         Dnsimple::Response.new(response, nil)
       end
-
-      # Resets the domain token.
-      #
-      # @see https://developer.dnsimple.com/v2/domains/#reset-token
-      #
-      # @param  [Integer] account_id the account ID
-      # @param  [#to_s] domain_id The domain ID or domain name
-      # @param  [Hash] options
-      # @return [Dnsimple::Response<nil>]
-      #
-      # @raise  [Dnsimple::NotFoundError]
-      # @raise  [Dnsimple::RequestError]
-      def reset_domain_token(account_id, domain_id, options = {})
-        response = client.post(Client.versioned("/%s/domains/%s/token" % [account_id, domain_id]), nil, options)
-
-        Dnsimple::Response.new(response, Struct::Domain.new(response["data"]))
-      end
-
     end
   end
 end

spec/dnsimple/client/domains_spec.rb

@@ -204,31 +204,4 @@
       end
     end
   end
-
-  describe "#reset_domain_token" do
-    let(:account_id) { 1010 }
-    let(:domain_id) { "example.com" }
-
-    before do
-      stub_request(:post, %r{/v2/#{account_id}/domains/#{domain_id}/token})
-          .to_return(read_http_fixture("resetDomainToken/success.http"))
-    end
-
-    it "builds the correct request" do
-      subject.reset_domain_token(account_id, domain_id)
-
-      expect(WebMock).to have_requested(:post, "https://api.dnsimple.test/v2/#{account_id}/domains/#{domain_id}/token")
-          .with(headers: { 'Accept' => 'application/json' })
-    end
-
-    it "returns the domain" do
-      response = subject.reset_domain_token(account_id, domain_id)
-      expect(response).to be_a(Dnsimple::Response)
-
-      result = response.data
-      expect(result).to be_a(Dnsimple::Struct::Domain)
-      expect(result.id).to be_a(Integer)
-    end
-  end
-
 end