Merge pull request dalek-cryptography#95 from trevor-crypto/patch-1

Add constant time warning to `unwrap_or_else`

Author: isislovecruft

src/lib.rs

@@ -651,6 +651,9 @@ impl<T> CtOption<T> {
 
     /// This returns the underlying value if it is `Some`
     /// or the value produced by the provided closure otherwise.
+    ///
+    /// This operates in constant time, because the provided closure
+    /// is always called.
     #[inline]
     pub fn unwrap_or_else<F>(self, f: F) -> T
     where