Increased the minimum Node version to v10

Author: JamesMessinger

package.json

@@ -36,7 +36,7 @@
 "release": "npm run upgrade && npm run clean && npm run build && npm test && npm run bump"
  },
 "engines":{
-"node": ">=8"
+"node": ">=10"
  },
 "devDependencies":{
 "@types/chai": "^4.1.7",