Upon initialisation, a courtesy check is now done for the experimental http2 implementation in node.
This lets developer(s) know that this module will not work with the new http2 implementation. When used in a version of node that has it exposed, an error will be thrown.
The new implementation is a bit different to the http2 module's implementation that this module is made to help work with express. Hopefully express will be updated to work with the new implementation, otherwise I may consider adding support with this module (if possible).