Optional rustls support #172
Merged
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Added a default feature
tls-nativewith the status quo, and a non-default featuretls-rustlswhich uses rustls (with rustls-native-certs to use the platform's native cert store).This also adds a dependency on lazy_static so that the TLS connector is only created once (saves parsing all the certs repeatedly), but lazy_static was already in the dependency tree due to several other packages in the tree depending on it.