Minor speed improvements

[basiliscos]

No description provided.

[codecov]

Codecov Report

Merging #28 into master will decrease coverage by 0.18%.
The diff coverage is 97.29%.

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
- Coverage   93.64%   93.45%   -0.19%     
==========================================
  Files          11       11              
  Lines         425      428       +3     
==========================================
+ Hits          398      400       +2     
- Misses         27       28       +1

Impacted Files	Coverage Δ
include/bredis/impl/common.ipp	100% <100%> (ø)	⬆️
include/bredis/impl/connection.ipp	88.37% <100%> (ø)	⬆️
include/bredis/impl/async_op.ipp	98.48% <96%> (-1.52%)	⬇️

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