chore: Add back unstable feature

badboy · badboy · commit 88788ea5513d · 2016-03-01T17:49:42.000+01:00
This does not enable anything, but we keep it around nonetheless.
diff --git a/Cargo.toml b/Cargo.toml
@@ -19,3 +19,4 @@ default = []
 
 # For debugging output
 debug = []
+unstable = []
