update test dependencies

Author: justadudewhohacks

test/package-lock.json

@@ -13,9 +13,9 @@
   "author": "justadudewhohacks",
   "license": "MIT",
   "dependencies": {
-    "chai": "^4.1.0",
+    "chai": "^4.1.2",
     "istanbul": "^0.4.5",
-    "mocha": "^3.5.3"
+    "mocha": "^5.2.0"
   },
   "devDependencies": {
     "eslint": "^3.18.0",