Bump version.go for new release 0.4.2

CpuID · CpuID · commit 74ea16a595fe · 2017-05-11T14:21:56.000+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 = "0.4.1"
+const ecs_discoverer_version = "0.4.2"
