Use exact match for QID

[henrywu2019]

Go's MatchString is not exact match, more like ContainString. This PR is to fix it.

fix #30

[codecov]

Codecov Report

Merging #31 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            master       #31    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           14        14            
  Lines         1461      1279   -182     
==========================================
- Hits          1461      1279   -182     

Impacted Files	Coverage Δ
go/utils.go	100.00% <ø> (ø)
go/wg.go	100.00% <0.00%> (ø)
go/cost.go	100.00% <0.00%> (ø)
go/rows.go	100.00% <0.00%> (ø)
go/trace.go	100.00% <0.00%> (ø)
go/wgtag.go	100.00% <0.00%> (ø)
go/config.go	100.00% <0.00%> (ø)
go/driver.go	100.00% <0.00%> (ø)
go/result.go	100.00% <0.00%> (ø)
... and 5 more

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