Added invalid input alert while zero is input

NadalVRoMa / PyLibGen

A python script to download books from libgen.io

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Closed saifat29 closed 7 years ago

saifat29 commented 7 years ago

Reference - Issue #3

NadalVRoMa commented 7 years ago

Since I commited to your other pull request, I close this and modify the master to resolve #3