update current version

Author: Healthedata1

xml/FHIR-smart.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<specification xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ciUrl="http://build.fhir.org/ig/HL7/smart-app-launch" defaultVersion="current" defaultWorkgroup="fhir-i" gitUrl="https://github.com/HL7/smart-app-launch" url="http://hl7.org/fhir/smart-app-launch">
+<specification xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ballotUrl="http://hl7.org/fhir/smart-app-launch/2021May" ciUrl="http://build.fhir.org/ig/HL7/smart-app-launch" defaultVersion="2.0.0" defaultWorkgroup="fhir-i" gitUrl="https://github.com/HL7/smart-app-launch" url="http://hl7.org/fhir/smart-app-launch">
 <version code="current" url="http://build.fhir.org/ig/HL7/smart-app-launch"/>
 <version code="2.0.0" url="http://hl7.org/fhir/smart-app-launch/STU2"/>
 <version code="1.1.0" url="http://hl7.org/fhir/smart-app-launch/2021May"/>