Does your PR solve an issue?

fixes transact-rs#960

Is this a breaking change?

no

new feature tls-rustls-no-provider-platform-verifier installs no crypto library and uses CryptoProvider::get_default() instead. This will work the same as Reqwest's rustls-tls-native-roots-no-provider feature, when coupled with rustls-platform-verifier crate .

See https://docs.rs/rustls/latest/rustls/crypto/struct.CryptoProvider.html#using-the-per-process-default-cryptoprovider :

libraries should use ClientConfig::builder()/ServerConfig::builder() or otherwise rely on the CryptoProvider::get_default() provider.