chore(deps): update dependency sinon to v1.17.7 (#501)

This Pull Request updates dependency [sinon](https://github.com/sinonjs/sinon) from `v1.17.6` to `v1.17.7`



<details>
<summary>Release Notes</summary>

### [`v1.17.7`](sinonjs/sinon@v1.17.6...v1.17.7)
[Compare Source](sinonjs/sinon@v1.17.6...v1.17.7)


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</details>




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package.json

@@ -70,7 +70,7 @@
     "proxyquire": "1.8.0",
     "semantic-release": "6.3.6",
     "semver": "5.5.0",
-    "sinon": "1.17.6"
+    "sinon": "1.17.7"
   },
   "dependencies": {
     "cachedir": "^1.1.0",