Speedup `thefuck --alias`

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Some users complain that thefuck --alias call increases shell startup time.

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Related:

• Importing pkg_resources is slow. Work is done at import time. pypa/setuptools#926
• https://github.com/ninjaaron/fast-entry_points

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Before:

thefuck --alias  0,29s user 0,01s system 99% cpu 0,303 total

After:

thefuck --alias  0,13s user 0,02s system 99% cpu 0,149 total