bump version 0.2.0 -> 0.3.0 and update CHANGELOG

Author: RCasatta

CHANGELOG.md

@@ -1,3 +1,10 @@
+# 0.3.0 - Jan 30, 2024
+
+- Add simplicity
+- Use rust-bitcoin 0.31.0
+- [elip150](https://github.com/ElementsProject/ELIPs/blob/main/elip-0150.mediawiki)
+- [elip151](https://github.com/ElementsProject/ELIPs/blob/main/elip-0151.mediawiki)
+
 # 0.2.0 - June 15, 2023
 
 - Still rapid iteration, very unstable.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "elements-miniscript"
-version = "0.2.0"
+version = "0.3.0"
 authors = ["Andrew Poelstra <apoelstra@wpsoftware.net>, Sanket Kanjalkar <sanket1729@gmail.com>"]
 repository = "https://github.com/ElementsProject/elements-miniscript"
 description = "Elements Miniscript: Miniscript, but for elements"