Merge #786: Minor: fix missing import in doc example

7b7085f Minor: fix missing import in doc example (Peter Todd)

Pull request description:

  Also, how do I get the doc-tests to actually test this example?

ACKs for top commit:
  Kixunil:
    ACK 7b7085f
  apoelstra:
    ACK 7b7085f; successfully ran local tests

Tree-SHA512: 21b839122f450cd4eea09bc4119e2f89ae31af7a6ebf8f732a06f7ad773f18fc975027a1508d1ba671cea8b414be8b10b79316af46fd5df0328d4b26adf2848d

Author: apoelstra

src/lib.rs

@@ -47,7 +47,7 @@
 //!
 //! ```rust
 //! # #[cfg(all(feature = "global-context", feature = "hashes", feature = "rand", feature = "std"))] {
-//! use secp256k1::{generate_keypair, Message};
+//! use secp256k1::{rand, generate_keypair, Message};
 //! use secp256k1::hashes::{sha256, Hash};
 //!
 //! let (secret_key, public_key) = generate_keypair(&mut rand::thread_rng());