Support Angular 9 & Bazel #261

Attempting to build an app containing this module using Bazel throws the following warning and error:

Warning: Entry point 'angular2-jsonapi' contains deep imports into '~/node_modules/lodash-es/find', '~/node_modules/lodash-es/includes'. This is probably not a problem, but may cause the compilation of entry points to be out of order.

Error: Error on worker #4: Error: Expected UMD module file (~/node_modules/angular2-jsonapi/node_modules/qs/lib/utils.js) to contain exactly one statement, but found 15.