change PKG_TAG for v3.0.5
diff --git a/pkgconfig.mk b/pkgconfig.mk
index 492f53f..6d185c9 100644
--- a/pkgconfig.mk
+++ b/pkgconfig.mk
@@ -9,4 +9,4 @@
 PKG_EXTRA = 5
 
 # version tag. Examples: rc1, b2, post1
-PKG_TAG = rc3
+PKG_TAG =