Bump changelog version to 6.4 (elastic#30217)

This commit bumps the changelog version to 6.4 as now that 6.3 is feature frozen there would be no additional entries in the changelog for 6.3.0.
jasontedor · Apr 27, 2018 · 4494565 · 4494565
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commit 4494565
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/docs/CHANGELOG.asciidoc b/docs/CHANGELOG.asciidoc
@@ -31,7 +31,7 @@ written to by an older Elasticsearch after writing to it with a newer Elasticsea
 
 === Known Issues
 
-== Elasticsearch version 6.3.0
+== Elasticsearch version 6.4.0
 
 === New Features