0.5.0

Changelog

0759638 preparing for 0.5.0 release
ae0b4c1 Merge pull request #15 from sensu/feature/metrics-option
8c9652d fix linter action
254a7b6 make linter happy
f8cd224 refactor critical and warning metrics for enhanced utility
ffea756 refactor metrics output for human readable prometheus metric format
30c8506 update changelog
7ba3dda initial commit for metrics output support
6cd1e67 formatting cleanup after merge
ee3be81 formatting cleanup after merge
4816298 Merge pull request #10 from boagg/feature/add-human-readable
2485559 Add --human-readable option