Merge pull request #25 from CMSgov/jfuqian/BB2-1891-Fix-Python-SDK-readme-supported-FHIR-ver-STU2-to-STU3

[BB2-1891] Fix Python SDK README.md: Change Supported FHIR versions. STU2 to STU3

Author: James Fuqian

README.md

@@ -73,7 +73,7 @@ The Blue Button 2.0 API is available in V1 and V2 in a sandbox and production en
 
 Version data formats:
 
-- V1: FHIR STU2
+- V1: FHIR STU3
 - V2: FHIR R4
 
 Sample configuration JSON with default version and environment: