[fix] re #173: add alias target ryml::ryml

[biojppm]

fixes #173

[codecov]

Codecov Report

Merging #174 (e94339b) into master (4a8fb19) will decrease coverage by 0.00%.
The diff coverage is n/a.

❗ Current head e94339b differs from pull request most recent head f7fae52. Consider uploading reports for the commit f7fae52 to get more accurate results

@@            Coverage Diff             @@
##           master     #174      +/-   ##
==========================================
- Coverage   96.35%   96.35%   -0.01%     
==========================================
  Files          63       63              
  Lines       12845    12843       -2     
==========================================
- Hits        12377    12375       -2     
  Misses        468      468              

Impacted Files	Coverage Δ
test/test_basic.cpp	99.92% <0.00%> (-0.01%)	⬇️
src/c4/yml/std/string.hpp	100.00% <0.00%> (ø)

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