Merge #105: Bump to v0.15.0

bd16116 Bump to v0.15.0 (Alekos Filini)

Pull request description:

ACKs for top commit:
  danielabrozzoni:
    ACK bd16116

Tree-SHA512: c184fe6ed2f2b3ad5282b4ddb2d3186dcadee4685a417ebff0f9ab9e1c9a5596d91dc561c831ae7131fc63a0401f4dc29ece30024c09e11b99683f613e8ed856

Author: danielabrozzoni

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "electrum-client"
-version = "0.14.0"
+version = "0.15.0"
 authors = ["Alekos Filini <alekos.filini@gmail.com>"]
 license = "MIT"
 homepage = "https://github.com/MagicalBitcoin/rust-electrum-client"