Update GPL version on Github

Non-technical Questions Licenses and Presale
#1

It’s in everyone’s best interest to make using the GPL suite as easy as possible.

Would you please update the repository on GitHub to 4.5.1, so that people can easily include it as a submodule?

github.com/DHTMLX/dhtmlx-suite-gpl/issues/1

#2

GitHub repo and bower are updated with latest DHTMLX 4.5.1

#3

Great! :mrgreen: