Fix heap benchmark and use BenchmarkTools

[milesfrain]

No description provided.

[codecov]

Codecov Report

Merging #525 into master will decrease coverage by 0.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #525      +/-   ##
==========================================
- Coverage   93.23%   93.07%   -0.16%     
==========================================
  Files          32       32              
  Lines        2541     2541              
==========================================
- Hits         2369     2365       -4     
- Misses        172      176       +4

Impacted Files	Coverage Δ
src/robin_dict.jl	97.24% <0%> (-1.84%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 16f4bca...60f092b. Read the comment docs.

[codecov]

Codecov Report

Merging #525 into master will decrease coverage by 0.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #525      +/-   ##
==========================================
- Coverage   93.23%   93.07%   -0.16%     
==========================================
  Files          32       32              
  Lines        2541     2541              
==========================================
- Hits         2369     2365       -4     
- Misses        172      176       +4

Impacted Files	Coverage Δ
src/robin_dict.jl	97.24% <0%> (-1.84%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 16f4bca...60f092b. Read the comment docs.

[codecov]

Codecov Report

Merging #525 into master will decrease coverage by 0.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #525      +/-   ##
==========================================
- Coverage   93.23%   93.07%   -0.16%     
==========================================
  Files          32       32              
  Lines        2541     2541              
==========================================
- Hits         2369     2365       -4     
- Misses        172      176       +4

Impacted Files	Coverage Δ
src/robin_dict.jl	97.24% <0%> (-1.84%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 16f4bca...60f092b. Read the comment docs.

[oxinabox]

LGTM

[milesfrain]

Closing in favor of #531