bump version to 0.7.3

Author: crossle

CHANGELOG.md

@@ -42,3 +42,5 @@
 ## [0.7.1] -
 
 ## [0.7.2] -
+
+## [0.7.3] -

pubspec.yaml

@@ -1,6 +1,6 @@
 name: libsignal_protocol_dart
 description: Signal Protocol libray for Dart native and Flutter, pure Dart implementation of the the Signal Protocol
-version: 0.7.2
+version: 0.7.3
 repository: https://github.com/MixinNetwork/libsignal_protocol_dart
 topics:
  - crypto