Publish dgraph-js with the next tag after a successful travis build

Issues Dgraph Clients
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#1

Moved from GitHub dgraph-js/6

Posted by gpahal:

On every successful travis build, we can publish dgraph-js to npm with the next tag.

Users can then install this bleeding edge version using npm install dgraph-js@next --save, test it and provide feedback.

#2

gpahal commented :

npm doesn’t allow deleting already published versions. So the publish step will involve updating the version in the package.json to something like “1.0.5-beta.7” and creating a new version release which is not the best thing to do. So, this is not in the current plans.

#3