Fix duplicated docs

Signed-off-by: Silas Davis <silas@monax.io>

CHANGELOG.md

 # Hyperledger Burrow Changelog
 ## Version 0.20.0
-This is a major (pre-1.0.0) release that brings upgrades, and new grpc services.
+This is a major (pre-1.0.0) release that introduces the ability to change the validator set through GovTx, transaction execution history, and fuller GRPC endpoint.
 
 #### Breaking changes
 - Address format has been changed (by Tendermint and we have followed suite) - conversion is possible but simpler to regenerated keys
@@ -21,6 +21,8 @@ This is a major (pre-1.0.0) release that brings upgrades, and new grpc services.
 #### Bug fixes
 - Fixed panic on nil bounds for blocks service
 
+
+
 ## Version 0.19.0
 This is a major (pre-1.0.0) release that brings upgrades, safety improvements, cloud configuration, and GRPC endpoints to Burrow.
 

NOTES.md

+This is a major (pre-1.0.0) release that introduces the ability to change the validator set through GovTx, transaction execution history, and fuller GRPC endpoint.
+
 #### Breaking changes
 - Address format has been changed (by Tendermint and we have followed suite) - conversion is possible but simpler to regenerated keys
 - JSON-RPC interface has been removed
@@ -16,3 +18,5 @@
 
 #### Bug fixes
 - Fixed panic on nil bounds for blocks service
+
+

project/history.go

@@ -29,7 +29,7 @@ func FullVersion() string {
 // release tagging script: ./scripts/tag_release.sh
 var History relic.ImmutableHistory = relic.NewHistory("Hyperledger Burrow").MustDeclareReleases(
 	"0.20.0",
-	`This is a major (pre-1.0.0) release that brings upgrades, safety improvements, cloud configuration, and GRPC endpoints to Burrow.
+	`This is a major (pre-1.0.0) release that introduces the ability to change the validator set through GovTx, transaction execution history, and fuller GRPC endpoint.
 
 #### Breaking changes
 - Address format has been changed (by Tendermint and we have followed suite) - conversion is possible but simpler to regenerated keys