修复splice后跳过下一个元素的问题

[zhaqiezi]

修复splice后，数组元素变动，而索引还在自增导致跳过下一个元素问题

[codecov-io]

Codecov Report

Merging #6 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master     #6   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines          65     66    +1     
  Branches        8      8           
=====================================
+ Hits           65     66    +1

Impacted Files	Coverage Δ
src/EventBus.ts	100% <100%> (ø)	:arrow_up:

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