Rename all .txt PEP files to .rst

[mozillazg]

Only rename files, others PR will update pep2html.py and pep0.

[Mariatta]

Thanks @mozillazg!

[Mariatta]

Sorry @mozillazg. After I merged your PR, it erased the history of the PEPs; each pep-*.rst was treated as a brand new file. So I had to revert your changes to retain the history.

[methane]

Please wait for reverting.

it erased the history of the PEPs; each pep-*.rst was treated as a brand

new file. Do you mean ’git log’ or github’s file history? git doesn't save history. It calculate history. So it can't remove history. I think there is some way to give some hint when making history.

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[Mariatta]

@methane, sorry, 'erased' was the wrong word I shouldn't have used it. What happened was that when a file was renamed, GitHub is only showing the new file history since the rename. So after pep-0008.txt was renamed to pep-0008.rst, on GitHub I could no longer see all the revision ever made to PEP 8.
On the command line, git log pep-0008.rst also does not show the complete revision history. Only that it was renamed. We have to do git log --follow pep-0008.rst to get the complete history.
I think not being able to easily see the history in GitHub is inconvenient and I'm not comfortable with it.
So I reverted the commit for now. (everything is in . txt again).