Kamble, how do you know the script is not running?
Are you sure you arrive to step 5) of my questions?
If you do, do something to be sure it is pushed properly:
Delete the init.qcom.post_boot.sh on your PC and redo the step 3)
Once done open again the script file to see if your file was changed.
If yes check again your modifications.
I made this modification two weeks ago on the version #128 as I did for the #99 and for me all is alright.