summernote: Installing summernote fails if husky isn't installed

Description of your Issue or Request:

npm install is broken since version 0.8.19. The postinstall-script runs sh -c husky install which fails if husky isn’t installed:

npm ERR! command failed
npm ERR! command sh -c husky install
npm ERR! sh: 1: husky: not found

steps to reproduce (Add more if necessary):

1. Use a system without husky installed
2. Run npm i summernote

What is your Operating System, Browser and Version and Summernote Version you are using:

This can help find and resolve any issues, place an x inside the brackets or if relevant elaborate after each choice.

1. Operating System: [ ] Microsoft Windows [ ] Apple [x] Linux [ ] All