Support multiple `--skip-after`

[bsilver8192]

perf is stopping short on some of my backtraces (I think it's related to complex C++ code in the stack), which fragments the relevant functions in the flamegraph. --skip-after works great to avoid this, but I want to do it for multiple functions.

[codecov[bot]]

Codecov Report

Merging #231 (6a8dbdb) into master (4732660) will decrease coverage by 0.15%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #231      +/-   ##
==========================================
- Coverage   87.01%   86.85%   -0.16%     
==========================================
  Files          17       17              
  Lines        2379     2396      +17     
==========================================
+ Hits         2070     2081      +11     
- Misses        309      315       +6     

Impacted Files	Coverage Δ
src/collapse/perf.rs	97.97% <100.00%> (+0.12%)	:arrow_up:
src/flamegraph/svg.rs	76.07% <0.00%> (-1.85%)	:arrow_down:
src/flamegraph/mod.rs	86.89% <0.00%> (-1.04%)	:arrow_down:

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[bsilver8192]

This looks great, and definitely sounds useful! Could you add a test with multiple skip-afters though? Or just update the current one to have multiple filters?

Done. I went with adding a new one to make sure all the branches are covered (I assume that's what codecov is saying? I haven't dug into what numbers it's reporting).