Merge rust-bitcoin/rust-bitcoin#771: Add Witness::new()

5d27c15717 Add Witness::new() (sanket1729)

Pull request description:

  Rebasing rust-miniscript on rust-bitcoin master. Expect more trivial PRs :)

ACKs for top commit:
  dr-orlovsky:
    ACK 5d27c15717
  apoelstra:
    ACK 5d27c15717

Tree-SHA512: f1b6b1bba1ba6f153416be514b53d64bb6ba0c1cc1f182857f5010a048004f884d5c36ef96f6e27837bf682d781e3a4375bf2303e1f53685019406e88e192a03

src/blockdata/witness.rs

@@ -120,6 +120,12 @@ impl Encodable for Witness {
 }
 
 impl Witness {
+
+    /// Create a new empty [`Witness`]
+    pub fn new() -> Self {
+        Witness::default()
+    }
+
     /// Creates [`Witness`] object from an array of byte-arrays
     pub fn from_vec(vec: Vec<Vec<u8>>) -> Self {
         let witness_elements = vec.len();