Do not use --no-cache-dir for pre.txt.
Do not use --no-cache-dir for pre.txt.

The --no-cache-dir option is not defined on older versions of pip.
The pre.txt requirements specifically upgrade to a newer pip, so
the option may not work on that file, but should work fine after it
has been loaded.

Stanford-Online/edx-analytics-pipeline,edx/edx-analytics-pipeline,edx/edx-analytics-pipeline,Stanford-Online/edx-analytics-pipeline,Stanford-Online/edx-analytics-pipeline,edx/edx-analytics-pipeline