[Users] PostCactus installation.

[Bilal Hameed]

Dear users,

I am installing "PostCactus" as $ pip install PostCactus. My python 
version is,

*Python 2.7.17*

Still, I am getting following error,

Defaulting to user installation because normal site-packages is not 
writeable
ERROR: Could not find a version that satisfies the requirement 
PostCactus (from versions: none)
ERROR: No matching distribution found for PostCactus

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