Rebrand to 'community' instead of 'unofficial'

Author: springcomp

README.md

@@ -1,7 +1,7 @@
 # JMESPath Enhancement Proposals
 
 Any changes to the JMESPath specification
-(https://jmespath-unofficial.github.io/jmespath.site/specification.html) must have a JEP (JMESPath Enhancement
+(https://jmespath-community.github.io/jmespath.site/specification.html) must have a JEP (JMESPath Enhancement
 Proposal) which is tracked in this repo.  There are implementations of JMESPath
 in over 9 different languages, and we want to make sure that any modifications
 to the spec make sense for all JMESPath libraries.  A JEP helps to work through