update changelog

Author: xwings

ChangeLog

@@ -2,16 +2,20 @@ This file details the changelog of Qiling Framework.
 
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 [Version 1.4.1]: Nov Xth, 2021
+
 - Clean and tidy up core utils module (WIP)
 - Clean and tidy up path module
 - Other small adjustments so support the above changes
 - Rearranged the code to be more Pythonic and more readable
 - Removed unused members and methods
 - Added typing annotations
+- Added ql.platform_os and ql.platform_arch
+- update ql.os.posix.const_mapping with more os/arch match
 
 
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 [Version 1.4.0]: Oct 20th, 2021
+
 - Added MCU Engine
 - Bug fix for qdb
 - Bug fix for debugger