Adding missing curly Brace in Usage example (actions#150)

packages/github/README.md

@@ -13,7 +13,7 @@ const core = require('@actions/core');
 async function run() {
     // This should be a token with access to your repository scoped in as a secret.
     // The YML workflow will need to set myToken with the GitHub Secret Token
-    // myToken: ${{ secrets.GITHUB_TOKEN }
+    // myToken: ${{ secrets.GITHUB_TOKEN }}
     // https://help.github.com/en/articles/virtual-environments-for-github-actions#github_token-secret
     const myToken = core.getInput('myToken');