Merge pull request #326 from web-push-libs/update_deps

Update some dependencies

Author: marco-c

package-lock.json

@@ -34,7 +34,7 @@
     "jws": "^3.1.3",
     "minimist": "^1.2.0",
     "urlsafe-base64": "^1.0.0",
-    "https-proxy-agent": "^2.1.1"
+    "https-proxy-agent": "^2.2.1"
   },
   "devDependencies": {
     "chalk": "^2.3.0",
@@ -50,7 +50,7 @@
     "portfinder": "^1.0.2",
     "selenium-assistant": "^5.3.0",
     "semver": "^5.1.0",
-    "sinon": "^4.0.1",
+    "sinon": "^5.0.7",
     "which": "^1.2.11"
   },
   "engines": {