README.md modified for avoiding prematured closing of the shell.

[s-tomar]

Checklist

• Used a personal fork of the feedstock to propose changes

Following the steps given in Uninstall Process, it is possible that a user might close the shell before the 3rd step is completed. In this case, the command conda won't be found in the path, and a full path needs to be given. A simple solution is to ignore closing the shell before all the 3 steps are completed.

[hmaarrfk]

thanks.