Compatibility changes for Angular 11

[samhinshaw]

It appears that Angular 11 has some breaking changes with HMR. This causes an error to be thrown when .destroy() is called in angular-hmr here. It appears that the error is originating from angular/core here. I am not sure about the cause of the change, but my guess is that Angular is now calling the destroy method itself, before angular-hmr would.

Simply removing this call (as suggested in this PR) appears to fix the issue, and HMR appears to be working fine. I have proposed a version bump, as I would guess that this change is breaking for versions of Angular <11.

Unknowns:

• I am not aware of what other implications this change might have (e.g. in use cases other than mine).
• I upgraded from Angular 9 to 11, so I am not sure with the implications are for Angular 10.

[AliYusuf95]

The destroy is called from angular hmr plugin:

https://github.com/angular/angular-cli/blob/c2b7260f7976ecfa2409fa4195d37f6f465b0da9/packages/angular_devkit/build_angular/src/webpack/plugins/hmr/hmr-accept.ts#L81