Update definitelyTyped

package.json

@@ -21,33 +21,33 @@
   },
   "homepage": "http://github.com/dex4er/js-null-writable",
   "engines": {
-    "node": ">=6.0.0"
+    "node": ">=v6.17.1"
   },
   "dependencies": {},
   "devDependencies": {
-    "@types/chai": "^4.2.3",
+    "@types/chai": "^4.2.18",
     "@types/dirty-chai": "^2.0.2",
     "@types/mocha": "^5.2.7",
-    "@types/node": "^12.7.11",
-    "chai": "^4.2.0",
-    "coveralls": "^3.0.6",
+    "@types/node": "^12.20.15",
+    "chai": "^4.3.4",
+    "coveralls": "^3.1.0",
     "cross-env": "^6.0.3",
     "dirty-chai": "^2.0.1",
-    "eslint": "^6.5.1",
-    "eslint-config-prettier": "^6.4.0",
-    "eslint-plugin-import": "^2.18.2",
+    "eslint": "^6.8.0",
+    "eslint-config-prettier": "^6.15.0",
+    "eslint-plugin-import": "^2.23.4",
     "eslint-plugin-node": "^10.0.0",
-    "eslint-plugin-promise": "^4.2.1",
-    "markdownlint-cli": "^0.18.0",
-    "mocha": "^6.2.1",
+    "eslint-plugin-promise": "^4.3.1",
+    "markdownlint-cli": "^0.27.1",
+    "mocha": "^6.2.3",
     "mocha-steps": "^1.3.0",
     "nyc": "^14.1.1",
-    "prettier": "^1.18.2",
-    "shx": "^0.3.2",
-    "ts-node": "^8.4.1",
-    "tslint": "^5.20.0",
+    "prettier": "^1.19.1",
+    "shx": "^0.3.3",
+    "ts-node": "^8.10.2",
+    "tslint": "^5.20.1",
     "tslint-config-prettier": "^1.18.0",
-    "typescript": "^3.6.3"
+    "typescript": "^3.9.9"
   },
   "scripts": {
     "compile": "tsc --pretty --project .",