Add relesing guide

RELEASING.md

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+# Releasing Frontail
+
+After all [pull requests](https://github.com/mthenw/frontail/pulls) for a release have been merged and all [Travis CI builds](https://travis-ci.org/mthenw/frontail) are green, you may create a release as follows:
+
+1. If you haven't already, switch to the master branch, ensure that you have no changes, and pull from origin.
+
+    ```sh
+    $ git checkout master
+    $ git status
+    $ git pull <remote> master --rebase
+    ```
+
+1. Edit the `package.json` file changing `version` field to your new release version and run `npm i`.
+
+1. Commit your changes.
+
+    ```sh
+    $ git commit -am "Release <version>"
+    ```
+
+1. Tag the version.
+
+    ```sh
+    $ git tag v<version>
+    ```
+
+1. Push the commit and tag.
+
+    ```sh
+    $ git push origin head --tags
+    ```
+
+1. Travis CI will publish new version to NPM.
+
+1. Publish new release on GitHub with [`release`](https://github.com/zeit/release) package.
+
+    ```sh
+    $ npx release -P
+    ```
+
+1. Upload binaries
+
+    ```sh
+    $ npm run pkg
+    ```