update install docs and checkout htslib 1.19 #198

Job	Run time
Run tests on Python windows-2022 MSYS2 UCRT64	9m 3s
sdist (3.12)	1m 34s
Run tests on Python pypy3.10 ubuntu-22.04	4m 16s
Run tests on Python 3.7 ubuntu-22.04	1m 10s
Run tests on Python 3.8 ubuntu-22.04	1m 18s
Docker Run Test on linux/amd64-alpine	2m 2s
Run tests on Python 3.9 ubuntu-22.04	1m 23s
Docker Run Test on linux/arm64-slim	13m 59s
Run tests on Python 3.10 ubuntu-22.04	1m 10s
Run tests on Python 3.11 ubuntu-22.04	1m 13s
Run tests on Python 3.12 ubuntu-22.04	1m 14s
Run tests on Python 3.12 macos-12	2m 41s
	41m 3s

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