Update version number and changelog

Author: ragingprodigy

CHANGELOG.md

@@ -1,3 +1,7 @@
+## [0.3.0-nullsafety.0] - Type Safety
+
+* Added type safety
+
 ## [0.2.1] - 26/04/2020
 * Custom post types
 

pubspec.yaml

@@ -1,12 +1,13 @@
 name: flutter_wordpress
 description: This library uses WordPress REST-API-V2 to provide a way for your application to
   interact with your WordPress website.
-version: 0.3.0
+version: 0.3.0-nullsafety.0
 authors:
   - Sachin Ganesh <sachin@dreamsoftin.com>
   - Suraj Shettigar <suraj@dreamsoftin.com>
   - Harm-Jan Roskam <harmjanroskam@gmail.com>
   - Yahya Makarim <ymakarim@gmail.com>
+  - Oladapo Adeola Omonayajo <omonayajo@zohomail.com>
 homepage: https://github.com/dreamsoftin/flutter_wordpress
 
 environment: