hook: python-shebang: check for shebang in the first line only
hook: python-shebang: check for shebang in the first line only

- Grepping whole files is inefficient
- git-instaweb (in git package) has the code to generate python file in
  a here doc in the middle of its code, old hook generates false
  positive with this package

necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages