Enable CI output for Infection

Author: WyriHaximus

infection.json.dist

@@ -9,7 +9,8 @@
  "text": "./var/infection.log",
  "summary": "./var/infection-summary.log",
  "json": "./var/infection.json",
- "perMutator": "./var/infection-per-mutator.md"
+ "perMutator": "./var/infection-per-mutator.md",
+ "github": true
  },
  "minMsi": 100,
  "minCoveredMsi": 100,