Bump version.go for new release 0.4.0

CpuID · CpuID · commit 2a6f8529c040 · 2017-04-15T13:41:45.000+10:00
diff --git a/version.go b/version.go
@@ -3,4 +3,4 @@ package main
 // NOTE: the script build_upload.sh manipulates this file with sed, ensure it still works
 // if this file is changed
 
-const ecs_discoverer_version = "0.3.4"
+const ecs_discoverer_version = "0.4.0"
