release: prepare changelog for 6.3.3

Author: rosen-vladimirov

CHANGELOG.md

@@ -1,6 +1,18 @@
 NativeScript CLI Changelog
 ================
 
+6.3.3 (2020, January 13)
+===
+
+### New
+
+* [Implemented #5205](https://github.com/NativeScript/nativescript-cli/issues/5205): Support build hooks
+
+### Fixed
+
+* [Fixed #3818](https://github.com/NativeScript/nativescript-cli/issues/3818): Cannot set property 'socket' of null
+
+
 6.3.2 (2020, January 9)
 ===