Master
- change file name, Certificate_20191017.xsd to Certificate.xsd
- change file name, QualifiedDataType_Cert_1p0.xsd to QualifiedDataType_Cert.xsd and change Certificate.xsd regarding this file name.
- update MessageInfo.json to reflect 1) and 2) and change version to be x.y (not x.y.z)
- add CHANGELOG file
- change url at Release to display page of tag info, so no need to update version number.