3.20.0 - March 20, 2016
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* Update license(Sahil Sareen)
* Use AM_DISTCHECK_CONFIGURE_FLAGS(Sahil Sareen)
* Bump up the license version on source files(Sahil Sareen)
* Update about dialog(Sahil Sareen)
* Update copyrights(Sahil Sareen)
* Require GTK+ 3.19(Sahil Sareen)
* Update the AppData to spec version 0.7+(Richard Hughes)
* Updated translations