Add feature for enabling signed and encrypted cookie support

The cookie crate uses the ring crate's HMAC module to implement signed
cookies and its AEAD module for authenticated encrypted cookies.

Signed-off-by: Johannes Löthberg <[email protected]>

Author: kyrias

Cargo.toml

@@ -21,6 +21,7 @@ docs = ["unstable"]
 unstable = []
 hyperium_http = ["http"]
 async_std = [] # "async-std" when it is not default
+cookie-secure = ["cookie/secure"]
 
 [dependencies]
 # Note(yoshuawuyts): used for async_std's `channel` only; use "core" once possible.