feat: Unify type of max field in example

[oskarwojciski]

avoid
field type conflict: input field "max" on measurement "stat" is type float, already exists as type integer dropped=1
error

Proposed Changes

Update example in README.md

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Merging #200 into master will decrease coverage by 0.63%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #200      +/-   ##
==========================================
- Coverage   89.04%   88.40%   -0.64%     
==========================================
  Files          27       27              
  Lines        1917     1553     -364     
==========================================
- Hits         1707     1373     -334     
+ Misses        152      122      -30     
  Partials       58       58              

Impacted Files	Coverage Δ
api/writeAPIBlocking.go	73.33% <0.00%> (-6.67%)	⬇️
options.go	91.11% <0.00%> (-3.41%)	⬇️
api/http/service.go	78.87% <0.00%> (-2.61%)	⬇️
api/write/options.go	93.33% <0.00%> (-2.59%)	⬇️
api/users.go	79.66% <0.00%> (-2.43%)	⬇️
internal/write/service.go	82.14% <0.00%> (-2.14%)	⬇️
api/delete.go	88.57% <0.00%> (-2.13%)	⬇️
client.go	85.98% <0.00%> (-1.62%)	⬇️
api/query/table.go	93.18% <0.00%> (-1.56%)	⬇️
api/query.go	86.84% <0.00%> (-1.37%)	⬇️
... and 17 more

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[vlastahajek]

@oskarwojciski, thanks for PR! Please, fix the first commit message to have the semantic format.