[bugfix] PullRefresh: ensure value change can be watched

[chenjiahan]

No description provided.

[codecov-io]

Codecov Report

Merging #3719 into dev will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             dev    #3719      +/-   ##
=========================================
+ Coverage   93.2%   93.21%   +<.01%     
=========================================
  Files        124      124              
  Lines       2695     2696       +1     
  Branches     248      248              
=========================================
+ Hits        2512     2513       +1     
  Misses       151      151              
  Partials      32       32

Impacted Files	Coverage Δ
src/pull-refresh/index.js	93.47% <100%> (+0.14%)	⬆️

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