Add test for team getter method in client_spec

Author: cltweedie

spec/bitbucket_rest_api/client_spec.rb

@@ -9,5 +9,6 @@
     expect(client.users).to be_a BitBucket::Users
     expect(client.user_api).to be_a BitBucket::User
     expect(client.invitations).to be_a BitBucket::Invitations
+    expect(client.teams).to be_a BitBucket::Teams
   end
 end