Update .gitignore
Update .gitignore

This update to the .gitignore pre-emptively adds a few folders, namely lib/, dist/, and venv/.
lib/ and dist/ are common names of folders used to store build artecfacts,
and venv/ is default environment name for Python virutal environments.

Signed-off-by: Carter Landis <ffc486ac0b21a34cfd7d1170183ed86b0f1b04a2@gmail.com>

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