Remove sinon-chai

Author: eddyerburgh

package.json

@@ -85,7 +85,6 @@
     "semver": "^5.3.0",
     "shelljs": "^0.7.4",
     "sinon": "2.0.0-pre.6",
-    "sinon-chai": "^2.8.0",
     "url-loader": "^0.5.7",
     "vue-loader": "^10.0.0",
     "vue-style-loader": "^1.0.0",