Log Message:
p5-YAML-LibYAML: update to 0.66.

0.66 Thu Aug 17 20:06:06 CEST 2017
 - Apply PR#55 (@vti++)
 - Dump() was modifying original data, adding a PV to numbers
 - Added a test for this (TINITA++)

0.65 Thu 18 May 23:09:38 CEST 2017
 - Prevent warning about unused variables (see issue#59)
 - Clarify documentation about exported functions