Upgrade dependencies

Author: philipstanislaus

build/arrayToTree.d.ts

@@ -10,16 +10,16 @@
   "dependencies": {},
   "devDependencies": {
     "@types/chai": "^4.0.4",
-    "@types/mocha": "^2.2.41",
+    "@types/mocha": "^5.2.7",
     "chai": "^4.1.2",
     "coveralls": "^3.0.0",
     "istanbul": "^0.4.5",
-    "mocha": "^4.0.1",
+    "mocha": "^6.1.4",
     "mocha-lcov-reporter": "^1.3.0",
-    "remap-istanbul": "^0.9.5",
+    "remap-istanbul": "^0.13.0",
     "tslint": "^5.2.0",
-    "tslint-config-standard": "^6.0.1",
-    "typescript": "^2.3.2",
+    "tslint-config-standard": "^8.0.1",
+    "typescript": "^3.5.2",
     "uglify-js": "^3.1.1"
   },
   "scripts": {