pip downloads 258 versions of boto3

[vamposdecampos]

As of commit d429483,

$ grep -o 'Downloading [^-]*' pip.log  | sort | uniq -c | sort -nr | head -4
    258 Downloading boto3
      9 Downloading django_admin_rangefilter
      6 Downloading botocore
      2 Downloading s3transfer

As the man says,

...
  Downloading boto3-1.12.26-py2.py3-none-any.whl (128 kB)
  Downloading boto3-1.12.25-py2.py3-none-any.whl (128 kB)
  Downloading boto3-1.12.24-py2.py3-none-any.whl (128 kB)
INFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce runtime. If you want to abort this run, you can press Ctrl + C to do so. To improve how pip performs, tell us what happened here: https://pip.pypa.io/surveys/backtracking

Full log: pip.log

Not fatal, just an optimization.