message: Allow chaining mockClear and mockReset
diff: @@ -387,11 +387,13 @@ class ModuleMockerClass {
  f.mockClear = () => {
  this._mockState.delete(f);
  + return f;
  };
  f.mockReset = () => {
  this._mockState.delete(f);
  this._mockConfigRegistry.delete(f);
  + return f;
  };
  f.mockReturnValueOnce = value => {
  