fix inconsistent calchash for utf8 tag

[ceshihao]

fix #286

It is because the different ways to calculate hash between readFieldHash and calcHash (by byte or rune)

go/iter_object.go

Line 49 in 10a568c

func (iter *Iterator) readFieldHash() int64 {

go/iter_object.go

Line 98 in 10a568c

func calcHash(str string, caseSensitive bool) int64 {

[codecov]

Codecov Report

Merging #296 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #296      +/-   ##
==========================================
- Coverage    81.5%   81.49%   -0.01%     
==========================================
  Files          41       41              
  Lines        5000     4999       -1     
==========================================
- Hits         4075     4074       -1     
  Misses        804      804              
  Partials      121      121

Impacted Files	Coverage Δ
iter_object.go	66.47% <100%> (-0.19%)	⬇️

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[taowen]

thank you