added new fields to example yaml [ci skip]
fixes #45

Simple handler to load custom OIDs from YAML. To use:

yaml_data = "
---
custom_oids:
-  :oid: 1.4.3.2.1.2.3.4
   :short_name: oidName
   :long_name: optional_long_name
-  :oid: 1.4.3.2.1.2.3.5
   :short_name: oidName2
   :long_name: optional_long_name2
"
R509::OIDMapper.register_from_yaml("custom_oids",yaml_data)