Enable Go modules by default

Changelog for 0.6.0:

• PR #68 Switch to io from ioutil to read body by @alexellis
• PR #66 Use of-watchdog 0.9.3 to suppress custom health check logging messages by @nitishkumar71
• PR #63 default go module to on by @cpanato

Commits
464715b Switch to io from ioutil to read body by @alexellis
5cd3573 use of watchdog 0.9.3 to suppress health check logs by @nitishkumar71
f299b05 default go module to on by @cpanato
4cf376c Update watchdog for extended log lines. by @alexellis
950006c Update watchdog to 0.9.1 by @alexellis

Changes: 0.5.0...0.6.0

Generated by Derek