chore(package): update @types/node to version 13.13.5

Closes #78

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
         "@types/minimatch": "^3.0.3",
         "@types/mocha": "^5.2.7",
         "@types/mz": "0.0.32",
-        "@types/node": "^12.11.7",
+        "@types/node": "^13.13.5",
         "browserify": "^16.5.0",
         "chai": "^4.2.0",
         "husky": "^3.0.9",