Replace usage of time.clock() with time.time()

[Harmon758]

time.clock() has been deprecated since Python 3.3:
https://docs.python.org/3.3/whatsnew/3.3.html#deprecated-python-modules-functions-and-methods
https://bugs.python.org/issue14309, https://www.python.org/dev/peps/pep-0418/#deprecated-function, https://hg.python.org/cpython/rev/314c3faea2fb, python/cpython@47620a6

With Python 3.7, it now emits a DeprecationWarning:
https://bugs.python.org/issue31803, python/cpython#4020, python/cpython@884d13a

C:\Program Files\Python37\lib\site-packages\aiml\Kernel.py:132: DeprecationWarning: time.clock has been deprecated in Python 3.3 and will be removed from Python 3.8: use time.perf_counter or time.process_time instead
  start = time.clock()
C:\Program Files\Python37\lib\site-packages\aiml\Kernel.py:159: DeprecationWarning: time.clock has been deprecated in Python 3.3 and will be removed from Python 3.8: use time.perf_counter or time.process_time instead
  print( "Kernel bootstrap completed in %.2f seconds" % (time.clock() - start) )
C:\Program Files\Python37\lib\site-packages\aiml\Kernel.py:193: DeprecationWarning: time.clock has been deprecated in Python 3.3 and will be removed from Python 3.8: use time.perf_counter or time.process_time instead
  start = time.clock()
C:\Program Files\Python37\lib\site-packages\aiml\Kernel.py:196: DeprecationWarning: time.clock has been deprecated in Python 3.3 and will be removed from Python 3.8: use time.perf_counter or time.process_time instead
  end = time.clock() - start
C:\Program Files\Python37\lib\site-packages\aiml\Kernel.py:202: DeprecationWarning: time.clock has been deprecated in Python 3.3 and will be removed from Python 3.8: use time.perf_counter or time.process_time instead
  start = time.clock()
C:\Program Files\Python37\lib\site-packages\aiml\Kernel.py:205: DeprecationWarning: time.clock has been deprecated in Python 3.3 and will be removed from Python 3.8: use time.perf_counter or time.process_time instead
  print( "done (%.2f seconds)" % (time.clock() - start) )
C:\Program Files\Python37\lib\site-packages\aiml\Kernel.py:329: DeprecationWarning: time.clock has been deprecated in Python 3.3 and will be removed from Python 3.8: use time.perf_counter or time.process_time instead
  start = time.clock()
C:\Program Files\Python37\lib\site-packages\aiml\Kernel.py:344: DeprecationWarning: time.clock has been deprecated in Python 3.3 and will be removed from Python 3.8: use time.perf_counter or time.process_time instead
  print( "done (%.2f seconds)" % (time.clock() - start) )

With Python 3.8:

The function time.clock() has been removed, it was deprecated since Python 3.3

https://docs.python.org/3.8/whatsnew/3.8.html#api-and-feature-removals
https://bugs.python.org/issue36895, python/cpython#13270, python/cpython@e250061, python/cpython#13286, python/cpython@b6a09ae

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Program Files\Python38\lib\site-packages\aiml\Kernel.py", line 132, in bootstrap
    start = time.clock()
AttributeError: module 'time' has no attribute 'clock'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Program Files\Python38\lib\site-packages\aiml\Kernel.py", line 202, in saveBrain
    start = time.clock()
AttributeError: module 'time' has no attribute 'clock'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Program Files\Python38\lib\site-packages\aiml\Kernel.py", line 329, in learn
    start = time.clock()
AttributeError: module 'time' has no attribute 'clock'

[Harmon758]

@paulovn Python 3.8.0 has now been released.
Can this be merged and released so the library can support Python 3.8?

[Harmon758]

Thanks!

[paulovn]

Thanks for the patch. I've generated version 0.9.3 (also updated to PyPi)