Remove CRLF line endings from README.rst.
Remove CRLF line endings from README.rst.

 * None of the other text files in the repository have CRLF line endings.

peters/winpty,fracting/winpty,traff/winpty,traff/winpty,rprichard/winpty,rprichard/winpty,traff/winpty,dscho/winpty,rprichard/winpty,fracting/winpty,fracting/winpty,dscho/winpty,rprichard/winpty,peters/winpty,peters/winpty,fracting/winpty,dscho/winpty,peters/winpty,traff/winpty,dscho/winpty