bump yarnrc

Author: borestad

package.json

@@ -64,13 +64,11 @@
     "tslint-config-standard": "^4.0.0"
   },
   "devDependencies": {
-    "@types/chai": "3.4.34",
     "@types/debug": "0.0.29",
     "@types/lodash": "^4.14.52",
     "@types/node": "^7.0.5",
     "@types/power-assert": "1.4.29",
     "ava": "^0.18.1",
-    "chai": "3.5.0",
     "coveralls": "^2.11.15",
     "nyc": "^10.1.2",
     "power-assert": "1.4.2",