feat: add default_author (#181)

* feat: add deafult_author and start using actions-toolkit

* fix: go back to @actions/core for logs

* chore: add debug after fetching user

* test: keep build not minified

* fix: don't use tools.exit

* fix: author_displayname

* fix: check github_token

* fix: back to minified builds

* fix: fetch email too

* fix: change option names

* docs: document changes

* docs: update "github-actions" example

package.json

@@ -32,6 +32,7 @@
   "homepage": "https://github.com/EndBug/add-and-commit#readme",
   "dependencies": {
     "@actions/core": "^1.2.7",
+    "actions-toolkit": "github:EndBug/actions-toolkit#core-actions",
     "js-yaml": "^4.1.0",
     "simple-git": "^2.27.0",
     "string-argv": "^0.3.1"