reqwest 0.13.0 on Rust Cargo

Breaking changes

rustls is now the default TLS backend, instead of native-tls.
rustls crypto provider defaults to aws-lc instead of ring. (rustls-no-provider exists if you want a different crypto provider)
rustls-tls has been renamed to rustls.
rustls roots features removed, rustls-platform-verifier is used by default.
- To use different roots, call tls_certs_only(your_roots).
native-tls now includes ALPN. To disable, use native-tls-no-alpn.
query and form are now crate features, disabled by default.
Long-deprecated methods and crate features have been removed (such as trust-dns, which was renamed hickory-dns a while ago).
Many TLS-related methods renamed to improve autocompletion and discovery, but previous name left in place with a "soft" deprecation. (just documented, no warnings)
- For example, prefer tls_backend_rustls() over use_rustls_tls().

start 0.13 dev by @seanmonstar in #2894
Make serde optional by introducing query, form features, and re-working WASM header parsing by @CathalMullan in #2858
replace ClientBuilder::dns_resolver with dns_resolver2 by @seanmonstar in #2898
feat: make Rustls the default TLS provider by @calavera in #2897
feat: consolidate TLS options with rustls-platform-verifier by @seanmonstar in #2891
remove long-deprecated methods: trust-dns and non-wasm-cors by @seanmonstar in #2899
rename rustls-tls feature to just rustls by @seanmonstar in #2900
remove deprecated features trust-dns and macos-system-configuration by @seanmonstar in #2901
chore: separate rustls and rustls-no-provider features by @seanmonstar in #2903
rustls: allow windows to use extra roots by @seanmonstar in #2904
v0.13.0-rc.1 by @seanmonstar in #2905
Enable ALPN by default in native-tls by @ducaale in #2907
v0.13.0 by @seanmonstar in #2915

Full Changelog: v0.12.28...v0.13.0