fix: upgrade @types/node from 12.12.37 to 12.12.38 (#14)

Snyk has created this PR to upgrade @types/node from 12.12.37 to 12.12.38.

See this package in NPM:
https://www.npmjs.com/package/@types/node

See this project in Snyk:
https://app.snyk.io/org/wallace41290/project/0d1ece67-26c4-440e-bf73-1d9186e20726?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -68,7 +68,7 @@
     "@types/d3-fetch": "^1.1.5",
     "@types/google.visualization": "0.0.52",
     "@types/jest": "^25.2.2",
-    "@types/node": "12.12.37",
+    "@types/node": "12.12.38",
     "colors": "^1.3.2",
     "commitizen": "^4.1.2",
     "coveralls": "^3.0.2",