message: fix: expose plugin interfaces
  fix
diff: import { testBOSHServer } from './v1/testBOSHServer';
  import Client from '../Client';
  import * as v1 from './v1'
  +import { AbstractPlugin } from '@src/plugin/AbstractPlugin';
  +import { EncryptionPlugin } from '@src/plugin/EncryptionPlugin';
  export default class JSXC {
  public static readonly version = __VERSION__;
  @@ -9,6 +11,10 @@ export default class JSXC {
  public static readonly register = v1.register;
  + public static readonly AbstractPlugin = AbstractPlugin;
  +
  + public static readonly AbstractEncryptionPlugin = EncryptionPlugin;
  +
  private static initialized = false;
  public numberOfCachedAccounts: number;
  