[bugfix] PullRefresh head overflow

[chenjiahan]

No description provided.

[codecov-io]

Codecov Report

Merging #436 into dev will increase coverage by 0.05%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##              dev     #436      +/-   ##
==========================================
+ Coverage   90.73%   90.79%   +0.05%     
==========================================
  Files          92       92              
  Lines        1705     1705              
  Branches      258      258              
==========================================
+ Hits         1547     1548       +1     
+ Misses         83       82       -1     
  Partials       75       75

Impacted Files	Coverage Δ
packages/pull-refresh/index.vue	98.14% <0%> (ø)	⬆️
packages/utils/scroll.js	91.42% <0%> (+2.85%)	⬆️

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