Introduce TODO-RELEASE file

It's going to be useful to track new dependency APIs being used which
require dependency version release and version bump during release of
osmo-sgsn.

Change-Id: Ia495a8577001c6a223c31f4ddd7eee289e3523c7
diff --git a/TODO-RELEASE b/TODO-RELEASE
new file mode 100644
index 0000000..1c5d61f
--- /dev/null
+++ b/TODO-RELEASE
@@ -0,0 +1 @@
+#component	what		description / commit summary line