Log Message:
Update to 0.67

Upstream changes:
0.67 Wed Nov 15 18:59:33 CET 2017
 - Support standard tags !!str, !!map and !!seq instead of dying. PR#67
   (TINITA++)
 - Support JSON::PP::Boolean and boolean.pm via $YAML::XS::Boolean. PR#66
   (TINITA++) Thanks also to Bj枚rn H枚hrmann for SvPV_nolen()