Add change_type()

[biojppm]

No description provided.

[codecov]

Codecov Report

Merging #171 (ec2c13c) into master (8c70f1e) will increase coverage by 0.00%.
The diff coverage is 99.00%.

@@           Coverage Diff           @@
##           master     #171   +/-   ##
=======================================
  Coverage   96.32%   96.32%           
=======================================
  Files          63       63           
  Lines       12702    12740   +38     
=======================================
+ Hits        12235    12272   +37     
- Misses        467      468    +1     

Impacted Files	Coverage Δ
src/c4/yml/tree.cpp	94.49% <96.55%> (+0.03%)	⬆️
src/c4/yml/detail/print.hpp	96.00% <100.00%> (+0.16%)	⬆️
src/c4/yml/node.hpp	97.68% <100.00%> (+0.02%)	⬆️
src/c4/yml/tree.hpp	98.82% <100.00%> (-0.04%)	⬇️
test/test_basic.cpp	99.92% <100.00%> (+<0.01%)	⬆️
src/c4/yml/std/string.hpp	100.00% <0.00%> (ø)
src/c4/yml/std/vector.hpp	100.00% <0.00%> (ø)

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