Releasing Serverless Framework Event Gateway Plugin

After all pull requests for a release have been merged and all Travis CI builds are green, you may create a release as follows:

If you haven't already, switch to the master branch, ensure that you have no changes, and pull from origin.
```
$ git checkout master
$ git status
$ git pull <remote> master --rebase
```
Edit the package.json file changing version field to your new release version.
Commit your changes.
```
$ git commit -am "Release <version>"
```
Tag the version.
```
$ git tag v<version>
```
Push the commit and tag.
```
$ git push origin head --tags
```
Travis CI will publish new version to NPM.
Publish new release on GitHub with release package.
```
$ npx release -P
```

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