Update Cairo.jl

[yakir12]

addresses #323

[codecov]

Codecov Report

Merging #324 into master will decrease coverage by 1.39%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #324      +/-   ##
==========================================
- Coverage   92.07%   90.67%   -1.40%     
==========================================
  Files           1        1              
  Lines         454      461       +7     
==========================================
  Hits          418      418              
- Misses         36       43       +7     

Impacted Files	Coverage Δ
src/Cairo.jl	90.67% <100.00%> (-1.40%)	⬇️

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