Readline

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* 57, 58: Now supports arm64 architecture (Apple M1, Raspberry Pi)
* Moved CI from Travis + multibuild to GitHub Actions + cibuildwheel
* Uses Python 3.11.0a7 readline.c (commit aac29af, 2021-10-13), OK for 3.10, 3.9
* Uses Python 3.8.8 readline.c (commit f9d7c12, 2021-02-16), also OK for 3.7
* Uses Python 2.7.18 readline.c (commit f32bcf8, 2019-11-07)
* Updated to build against readline 8.1 (patch-level 2)

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* Uses Python 3.7.4 readline.c (commit ef10f88, 2019-03-20), also OK for 3.8
* Uses Python 3.6.8 readline.c (commit 25555e0, 2018-12-08), also OK for 3.5
* Uses Python 3.4.4 readline.c (commit 7462b64, 2015-11-02)
* Uses Python 2.7.16 readline.c (commit 89b5ea2, 2018-12-19)
* Updated to build against readline 8.0

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* 42, 44: Address compiler issues (avoid Cygwin, fix multi-arch on gcc)
* 40: Make GPLv3 license explicit
* 39: Look for bash shell in more places
* Uses Python 2.x readline.c from hg 2.7 branch (95814:192f9efe4a38)
* Uses Python 3.x readline.c from hg 3.4 / 3.5 branch (95813:ec6ed10d611e)
* Updated to build against readline 6.3 (patch-level 8)

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* Major rework of OS X build process (detect arches, no custom flags)
* 20, 22, 28: Various issues addressed by new streamlined build
* 28: Use $CC or cc to compile libreadline instead of default gcc
* 35: Workaround for clang from Xcode 5.1 and Mac OS X 10.9.2
* Uses Python 3.4 readline.c from hg 3.4 branch (89086:3110fb3095a2)
* Updated to build against readline 6.3 (patch-level 3)

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* Renamed module to *gnureadline* to improve installation with pip
* 23, 25-27, 29-33: Tweaks and package reworked to gnureadline
* Uses Python 2.x readline.c from hg 2.7 branch (89084:6b10943a5916)
* Uses Python 3.x readline.c from hg 3.3 branch (89085:6adac0d9b933)
* Updated to build against readline 6.2 (patch-level 5)

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* 21: Fixed building on Python.org 3.3 / Mac OS 10.8