Update changelog

Author: Nash0x7E2

CHANGELOG.md

@@ -3,6 +3,10 @@ All notable changes to this project will be documented in this file.
 
 ## [Changes]
 
+### 3.0.0
+- Update all widgets to null safety 
+- Update engine to `1.56.0`
+
 ### 2.0.4
 - Add Flutter test import (Thank you @arthurdenner https://github.com/Nash0x7E2/awesome-flutter-snippets/pull/16)
 - Support for unit and widget test functions (Thank you @TNorbury https://github.com/Nash0x7E2/awesome-flutter-snippets/pull/20)

README.md

@@ -50,7 +50,7 @@ Awesome Flutter Snippets is a collection of commonly used Flutter classes and me
 <br>
 
 ## Requirements
-Vscode: ^1.39.0
+Vscode: `1.56.0`
 
 <br>
 
@@ -59,6 +59,10 @@ At this time, there are no known issues. If you discover a bug or would like to
 
 ## Release Notes
 
+### 3.0.0
+- Update all widgets to null safety 
+- Update engine to `1.56.0`
+
 ### 2.0.4
 - Add Flutter test import (Thank you @arthurdenner https://github.com/Nash0x7E2/awesome-flutter-snippets/pull/16)
 - Support for unit and widget test functions (Thank you @TNorbury https://github.com/Nash0x7E2/awesome-flutter-snippets/pull/20)