updated travis build matrix
MODIFY
.travis.yml
.travis.yml
dist: trusty
rvm:
- - 2.4.5
- - 2.5.5
- - 2.6.2
+ - 2.4.9
+ - 2.5.7
+ - 2.6.5
before_script:
- sudo rm -rf /usr/local/go
- curl -s https://dl.google.com/go/go1.12.7.linux-amd64.tar.gz | sudo tar xzCf /usr/local -

updated travis build matrix