Breaks in python 3.9 and up due to calls to time.clock() in Kernel.py

After installing with ``pip install aiml'', loading a kernel breaks due to calls to time.clock() in Kernel.py, making the package nonfunctional. Python 3.9 and up has removed time.clock(). This bug appears to have been patched at https://github.com/ArtificialIntelligenceToolkit/aiml/tree/master/aiml but pip seems to install an unpatched version.