Update chai dependencies

Author: julien-rg

package.json

@@ -66,15 +66,15 @@
     "babel-preset-env": "^1.6.0",
     "babel-preset-stage-2": "^6.24.1",
     "babel-register": "^6.26.0",
-    "chai": "^4.1.2",
+    "chai": "^4.2.0",
     "eslint": "^4.8.0",
     "eslint-config-standard": "^11.0.0-beta.0",
     "eslint-plugin-import": "^2.8.0",
     "eslint-plugin-node": "^6.0.0",
     "eslint-plugin-promise": "^3.6.0",
     "eslint-plugin-standard": "^3.0.1",
     "ganache-cli": "^6.4.3",
-    "mocha": "^6.1.4",
+    "mocha": "^7.0.0",
     "pm2": "^3.5.0",
     "solium": "^1.2.4",
     "truffle": "^5.0.14",