Go modules support and race condition fixes #60
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This PR was initially for go modules support and to fix a dependency's version (github.com/bshuster-repo/logrus-logstash-hook), but running go test -race ./... . showed roughly 4 cases of race conditions which i fixed as well.
The race conditions fix is a quick fix, but Ideally the Health Check handler should be rewritten to be more synchronous and stateless. Data should be passed around through channels instead of editing values in place and having to use locks to prevent write contention.