Move from lazy_static to once_cell::Lazy

[Sciencentistguy]

lazy_static is only passively maintained. Also, once_cell is faster (1-5% across cargo bench).

[codecov]

Codecov Report

Merging #249 (cd99b59) into master (172c9f4) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #249      +/-   ##
==========================================
+ Coverage   87.21%   87.22%   +0.01%     
==========================================
  Files          18       18              
  Lines        2527     2529       +2     
==========================================
+ Hits         2204     2206       +2     
  Misses        323      323              

Impacted Files	Coverage Δ
src/collapse/common.rs	59.25% <100.00%> (ø)
src/collapse/dtrace.rs	90.62% <100.00%> (+0.04%)	⬆️
src/collapse/perf.rs	97.98% <100.00%> (+<0.01%)	⬆️
src/flamegraph/mod.rs	87.03% <100.00%> (ø)

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[jonhoo]

Beautiful, thank you!

[jonhoo]

Published in 0.11.5 🎉