Prepare 0.12 release #1786

Job	Run time
Check Style	8s
linux / nightly	1m 22s
MSRV	1m 4s
Android	25s
unstable features	6s
WASM	1m 22s
linux / stable	1s
linux / beta	1s
macOS / stable	1s
windows / stable-x86_64-msvc	1s
windows / stable-i686-msvc	1s
windows / stable-x86_64-gnu	1s
windows / stable-i686-gnu	1s
feat.: default-tls disabled	50s
feat.: rustls-tls	45s
feat.: rustls-tls-manual-roots	40s
feat.: rustls-tls-native-roots	49s
feat.: native-tls	44s
feat.: default-tls and rustls-tls	50s
feat.: cookies	47s
feat.: blocking	49s
feat.: blocking only	34s
feat.: gzip	52s
feat.: brotli	50s
feat.: deflate	51s
feat.: json	49s
feat.: multipart	48s
feat.: stream	10s
feat.: socks/default-tls	47s
feat.: socks/rustls-tls	51s
feat.: hickory-dns	52s
Docs	0s
CI is green	0s
	18m 12s

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