Update CI scripts

9 jobs for master in 5 minutes and 4 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Syntax
passed #3838
jruby_1.7

00:03:57

passed #3839
jruby_9.1

00:02:53

passed #3832
ruby_2.1

00:03:36

passed #3833
ruby_2.2

00:03:56

passed #3834
ruby_2.3

00:03:09

passed #3835
ruby_2.4

00:02:05

passed #3836
ruby_2.5

00:01:30

passed #3837
ruby_2.6

00:03:12

 
  Linting
passed #3840
rubocop

00:01:05