Improve append!!(::SVector, ::SingletonVector)

[tkf]

No description provided.

[codecov]

Codecov Report

Merging #174 into master will decrease coverage by 0.17%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #174      +/-   ##
==========================================
- Coverage   92.09%   91.92%   -0.18%     
==========================================
  Files          22       22              
  Lines         481      483       +2     
==========================================
+ Hits          443      444       +1     
- Misses         38       39       +1     

Impacted Files	Coverage Δ
src/NoBang/base.jl	93.67% <66.66%> (-1.14%)	⬇️

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[tkf]

👍 https://github.com/JuliaFolds/BangBang.jl/blob/benchmark-results/2020/07/01/191841/result.md

[tkf]

👍 https://github.com/JuliaFolds/BangBang.jl/blob/benchmark-results/2020/07/01/195940/result.md