fix: upgrade @types/js-yaml from 3.12.3 to 3.12.4

Snyk has created this PR to upgrade @types/js-yaml from 3.12.3 to 3.12.4.

See this package in NPM:
https://www.npmjs.com/package/@types/js-yaml

See this project in Snyk:
https://app.snyk.io/org/teramotodaiki/project/1ffa79e5-1292-4f8b-8dbf-845c9365f9ca?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -88,7 +88,7 @@
     "@babel/runtime": "^7.8.4",
     "@hackforplay/log": "^1.3.4",
     "@hackforplay/skins": "^1.0.2",
-    "@types/js-yaml": "^3.12.2",
+    "@types/js-yaml": "^3.12.4",
     "rxjs": "^6.5.2"
   },
   "engines": {