rxjs-5-to-6-migrate appends comma

[mxchange]

It appends a comma after each refactored .pipe item:

),)

Like:

 .pipe(takeUntil(this.componentDestroyed$),)

[mgechev]

This comma is valid syntactically. In case you prefer to not have it in your code base, you can use prettier or clang-format once you run the migrations.