fix: tiles attribute in tilejson with x-rewrite-url

[stepankuzmin]

Closes #148

[codecov]

Codecov Report

Merging #266 (3065952) into master (194a83e) will increase coverage by 0.66%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master     #266      +/-   ##
==========================================
+ Coverage   51.46%   52.13%   +0.66%     
==========================================
  Files          14       14              
  Lines        1803     1805       +2     
==========================================
+ Hits          928      941      +13     
+ Misses        875      864      -11     

Impacted Files	Coverage Δ
src/server.rs	45.54% <73.33%> (+2.20%)	⬆️
src/utils.rs	87.30% <83.33%> (+3.96%)	⬆️

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