bug(dashmate): core version appears red even if it is latest version

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Expected Behavior

Version should appear green if it matches latest released version

Current Behavior

Version appears red in dashmate status core

Possible Solution

Ensure github handler gets correct major version and comparison works.

Steps to Reproduce (for bugs)

Context

Your Environment

• Version used: 0.24.12
• Environment name and version (e.g. Chrome 39, node.js 5.4):
• Operating System and version (desktop, server, or mobile):
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