Fix bug with CLI processing entire filesystem

[browniebroke]

Fixes #124

[sourcery-ai]

Sourcery Code Quality Report (beta)

Merging this PR leaves code quality unchanged.

	Before	After	Change
Quality	8.76	8.76	-0.0
Complexity	1.5	1.5	0.0
Method Length	45.27	45.37	0.1
Lines	135	135	0

Changed files	Quality Before	Quality After	Quality Change
django_codemod/cli.py	8.76	8.76	-0.0

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[codecov]

Codecov Report

Merging #126 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #126   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           17        17           
  Lines          455       455           
=========================================
  Hits           455       455           

Impacted Files	Coverage Δ
django_codemod/cli.py	100.00% <100.00%> (ø)

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