Update conf.yaml for APM Node release notes (#1271)

Author: bmorelli25

conf.yaml

@@ -1129,7 +1129,7 @@ contents:
                       -
                         repo:   apm-agent-nodejs
                         path:   CHANGELOG.asciidoc
-                        exclude_branches:   [ 3.x, 2.x, 1.x, 0.x ]
+                        exclude_branches:   [ 3.x, 1.x, 0.x ]
                   -
                     title:      APM Python Agent
                     prefix:     python