can rxmq support angular 8.x?

[dyh333]

I had update angular to v8.1, but found rxmq not work yet.

[yamalight]

@dyh333 Angular itself shouldn't matter to rxmq 🤔
which version of RxJS are you using?

[dyh333]

@yamalight . sorry, I means ng8 need rxjs version ~6.4.0. and I install rxjs v6.4.0 , rxmq v1.2.2

[dyh333]

@yamalight hi, I had found problem. angular v8 has a new feature:

The CLI's build command now automatically creates a modern ES2015 build with minimal polyfills and a compatible ES5 build for older browsers, and loads the appropriate file based on the browser. You may opt-out of this change by setting your target back to es5 in your tsconfig.json. Learn more on angular.io.

it means that in tsconfig, the default target is 'es2015', but rxmq build dist is es5 yet. so cause the bug above.
I change target to es5, rxmq will work well. but the method would not use the new feature of ng.
if rxmq could support both es5 and es2015(es6), that would be better.

thanks

[yamalight]

@dyh333 I haven't worked with Angular since v1.x so wouldn't know where to even start with this, but I would be more than happy to accept a PR that adds this feature!