Updated setup requirements to fix holoviews installation issue.

updated __version__ and __versionalias__
2 jobs for master in 17 seconds (queued for 4 seconds)
Status Name Job ID Coverage
failed test_geoarray #572


skipped pages #573
Name Stage Failure
test_geoarray Test There is an unknown failure, please try again
  File "/root/anaconda3/lib/python3.6/site-packages/setuptools-27.2.0-py3.6.egg/setuptools/sandbox.py", line 245, in runner
File "/root/anaconda3/lib/python3.6/site-packages/setuptools-27.2.0-py3.6.egg/setuptools/sandbox.py", line 47, in _execfile
File "/tmp/easy_install-5a7qyh7k/holoviews-1.8.0/setup.py", line 131, in <module>
File "/tmp/easy_install-5a7qyh7k/holoviews-1.8.0/setup.py", line 117, in package_assets
File "/tmp/easy_install-5a7qyh7k/holoviews-1.8.0/holoviews/__init__.py", line 10, in <module>
ModuleNotFoundError: No module named 'param'
Coverage.py warning: No data was collected. (no-data-collected)
make: *** [coverage] Error 1
ERROR: Job failed: exit code 1