bump to v3.1.2

Fix: certbot file bug

Fix: install bug

refactor!: refactor and update script

Merge pull request #2 from erfjab/dev

update to v2.1.1

Merge pull request #1 from erfjab/dev

Up to V2.0.0

fix some bugs essl.sh

fix some bugs essl.sh

fix some bogs essl.sh

Create README.md