Add a way to get gravityform's version (#1883)
Add a way to get gravityform's version (#1883)

* Add a way to get gravityform's version

This can be tested [here](https://about.mattermost.com/blog/)

* Fix a typo, thanks to @kkadosh

WPO-Foundation/Wappalyzer,WPO-Foundation/Wappalyzer,AliasIO/wappalyzer,AliasIO/wappalyzer,WPO-Foundation/Wappalyzer