Jason Noble

I've just encountered the same problem `error[E0271]: type mismatch resolving '::Target == secp256k1:: key::SecretKey' ` `expected struct 'secp256k1:: key::SecretKey', found struct 'SecretKey' ` **code causing error:** `let private_key = SecretKey::from_str(&env::var("PRIVATE_TEST_KEY").unwrap()).unwrap();`...