chore(package): update sinon to version 9.0.0

Closes #79

Author: greenkeeper[bot]

package.json

@@ -28,7 +28,7 @@
     "requirejs": "^2.3.6",
     "run-for-every-file": "^1.1.0",
     "shenanigans-manager": "^0.2.36",
-    "sinon": "^7.3.1",
+    "sinon": "^9.0.0",
     "sinon-chai": "^3.3.0",
     "tslint": "5.15.0",
     "tsutils": "^3.10.0",