Move release dev note to post-release #2118

Job	Run time
smoke	2m 46s
gremlin-console	6m 20s
gremlin-server unified	22m 46s
cache gremlin-server docker image	1m 36s
gremlin-server default	24m 54s
mvn clean install - jdk11	15m 44s
mvn clean install - jdk8	13m 30s
neo4j-gremlin	8m 39s
spark gryo (ubuntu-latest)	9m 37s
spark gryo (windows-latest)	3m 33s
spark core (ubuntu-latest)	12m 2s
spark core (windows-latest)	3m 24s
go	6m 20s
javascript (ubuntu-latest)	5m 39s
.NET	5m 31s
gremlin-driver	4m 8s
python	6m 19s
	2h 32m 48s

Provide feedback