Created temporary directory: /tmp/pip-ephem-wheel-cache-t2k9ald1
Created temporary directory: /tmp/pip-req-tracker-xdk9lmaf
Created requirements tracker '/tmp/pip-req-tracker-xdk9lmaf'
Created temporary directory: /tmp/pip-wheel-j791fa72
Collecting CacheControl==0.12.6
  1 location(s) to search for versions of CacheControl:
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  Getting page https://pypi.org/simple/cachecontrol/
  Analyzing links from page https://pypi.org/simple/cachecontrol/
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  Using version 0.12.6 (newest of versions: 0.12.6)
  Created temporary directory: /tmp/pip-unpack-6y0ioqp5
  Downloading https://files.pythonhosted.org/packages/18/71/0a9df4206a5dc5ae7609c41efddab2270a2c1ff61d39de7591dc7302ef89/CacheControl-0.12.6-py2.py3-none-any.whl
  Downloading from URL https://files.pythonhosted.org/packages/18/71/0a9df4206a5dc5ae7609c41efddab2270a2c1ff61d39de7591dc7302ef89/CacheControl-0.12.6-py2.py3-none-any.whl#sha256=10d056fa27f8563a271b345207402a6dcce8efab7e5b377e270329c62471b10d (from https://pypi.org/simple/cachecontrol/) (requires-python:>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*)
  Saved /tmp/tmp2fwneu8q/CacheControl-0.12.6-py2.py3-none-any.whl
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Skipping CacheControl, due to already being wheel.
Cleaning up...
  Removing source in /tmp/pip-wheel-j791fa72/CacheControl
Removed build tracker '/tmp/pip-req-tracker-xdk9lmaf'