Open a GitHub Issue if vulnerabilities are found (#8)

* Get GitHub access token from input

* install npm package

* fix TypeScript error to successfully build

ref: https://github.com/actions/toolkit/issues/199

* npm i strip-ansi to remove control characters

* create an issue

* use template literal to pass lint

* npm run format; npm run lint

* use inputs.issue_title as issue title

* document inputs.issue_title

* add inputs.issue_title

__tests__/main.test.ts

@@ -1,3 +1,3 @@
 describe('main', () => {
-  test.todo('Add a test suite');
-});
+  test.todo('Add a test suite')
+})