Update test dependencies

Author: renovate[bot]

package.json

@@ -24,9 +24,9 @@
     "node": ">=8.0.0"
   },
   "devDependencies": {
-    "chai": "4.2.0",
+    "chai": "4.3.6",
     "chai-as-promised": "7.1.1",
-    "coveralls": "3.1.0",
+    "coveralls": "3.1.1",
     "dependency-check": "3.4.1",
     "eslint": "5.16.0",
     "eslint-config-semistandard": "13.0.0",
@@ -40,7 +40,7 @@
     "mocha": "6.2.3",
     "nyc": "13.3.0",
     "sinon": "7.5.0",
-    "sinon-chai": "3.5.0"
+    "sinon-chai": "3.7.0"
   },
   "dependencies": {
     "ent": "^2.2.0",