Update CHANGELOG (arangodb#9601)

KVS85 · web-flow · commit 9cfa8faa9098 · 2019-07-29T20:51:09.000+03:00
diff --git a/CHANGELOG b/CHANGELOG
@@ -1,4 +1,4 @@
-v3.5.0-rc.6 (2019-XX-XX)
+v3.5.0-rc.6 (2019-07-29)
 ------------------------
 
 * Fixed issue #9459: Optimization rule remove-collect-variables does not KEEP all necessary data.

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-v3.5.0-rc.6 (2019-XX-XX)`
	`1`	`+v3.5.0-rc.6 (2019-07-29)`
`2`	`2`	`------------------------`
`3`	`3`
`4`	`4`	`* Fixed issue #9459: Optimization rule remove-collect-variables does not KEEP all necessary data.`