Automatically insert license header when it is not in the file

[ymotongpoo]

Runtime environment

• OS (version): any
• Hardware: any
• VS Code version: any
• VS Code build number: any
• other extensions installed: many

Behaviors

Expected behavior

On saving the file and if it doesn't have license header, automatically insert license header.

Actual behavior

Currently licenser doesn't automatically does that. Users have to run "insert license header" command manually.

Steps to reproduce the issue

1. Create new file or open a file without license header.

[bsekachev]

I noticed something.
If you open VSCode and create a new file, licenser doesn't insert a license header.
But if you insert it manually once Ctrl+Shift+Super+I, then when you create a new file again, licenser does insert a license header.

Version: 1.4.0

But I agree with the issue author.