Add an aws-lc-rs feature as an alias for aws_lc_rs (#57)

Cargo.toml

@@ -20,6 +20,7 @@ pki-types = { package = "rustls-pki-types", version = "1" }
 [features]
 default = ["logging", "tls12", "aws_lc_rs"]
 aws_lc_rs = ["rustls/aws_lc_rs"]
+aws-lc-rs = ["aws_lc_rs"] # Alias because Cargo features commonly use `-`
 early-data = []
 fips = ["rustls/fips"]
 logging = ["rustls/logging"]