MacOS Catalina default shell change to zsh causing issue in Bitrise

Following line in `install.sh` is not working on Bitrise:
`echo 'export PATH=/usr/local/kotlinc/bin:$PATH' >> ~/.bash_profile` which generate following error:
`/root/.bash_profile: No such file or directory`

I think the changing `.bash_profile` to `.zprofile` will fix the issue.

Start in install.sh at the command appending Kotlin's bin directory to ~/.bash_profile. Reproduce the installation in the Bitrise environment, check which shell startup file is available, and compare the resulting PATH. Done means the installer completes without the missing-file error and Kotlin is available on PATH.

Written by the indexing model from the issue text.