Update how release health is determined (#17) * Prefer Number() to parseInt(). Resolves #7 * Fix issue where action stalls for apps using >1 replica. Fixes #12 * Bump version to 0.4.0, update changelog * Update CHANGELOG.md per PR suggestion Co-authored-by: Mitchell Hanberg <[email protected]> Co-authored-by: Mitchell Hanberg <[email protected]>