Remove resource limits

- thanks docker tutorial
5 jobs for 154-docker-revision in 2 minutes and 33 seconds
Status Job ID Name Coverage
  Test
passed #3467
Go-py2.7

00:01:26

passed #3468
Go-py3.4

00:01:27

passed #3469
Go-py3.5

00:01:26

passed #3470
Go-py3.6

00:01:29

72.0%
 
  Lint
passed #3471
Go-flake8

00:01:03