warning issued for new version of openpyxl (2.0.3)
"import pandas" issues the following warning

C:\Users\aaa\AppData\Local\Enthought\Canopy32\User\lib\site-packages\pandas\io\excel.py:626: UserWarning: Installed openpyxl is not supported at this time. Use >=1.6.1 and <2.0.0.
  .format(openpyxl_compat.start_ver, openpyxl_compat.stop_ver))
