updated headless feature version

Change-Id: I8f57bd74e7562923fb84b9432ac6185154a98461

Author: vladdu

org.erlide.headless/feature.xml

@@ -2,7 +2,7 @@
 <feature
       id="org.erlide.headless"
       label="Erlide core (headless)"
-      version="0.9.3.qualifier"
+      version="0.9.4.qualifier"
       provider-name="erlide.org"
       plugin="org.erlide.core">