Built-in functions list doesn't differentiate between python 2 and 3 #207

Some built-in function were remove between python 2 and 3 , for example reload was put in imp module until python 3.3 then in importlib since 3.4.

But the list is static in the grammar file.

This behavior can be confusing, and it doesn't seems possible to configure the plugin for a specific version on python.