bump version to 0.7.3 and add changelog

Author: Moritz Borcherding

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ruzstd"
-version = "0.7.2"
+version = "0.7.3"
 authors = ["Moritz Borcherding <[email protected]>"]
 edition = "2018"
 license = "MIT"

Changelog.md

@@ -26,3 +26,9 @@ This document records the changes made between versions, starting with version 0
 * Preparations to become a std dependency (https://github.com/workingjubilee)
 
 # After 0.7.2
+* Soundness fix in decoding::RingBuffer. The lengths of the diferent regions where sometimes calculated wrongly, resulting in reads of heap memory not belonging to that ringbuffer
+    * Fixed by https://github.com/paolobarbolini
+    * Affected versions: 0.7.0 up to and including 0.7.2
+
+# After 0.7.3
+