Add compat. rule to require newt 1.1.0+.
Core 1.1.0+ requires newt 1.1.0+ (feature: self-overrides).  This change
enforces that requirement through a compatibility rule.
@@ -40,3 +40,11 @@ repo.versions:
"1.0-latest": "1.0.0" # 1.0.0
"1.1-latest": "1.1.0" # 1.1.0
"1.2-latest": "1.2.0" # 1.2.0
+
+repo.newt_compatibility:
+ # Core 1.1.0+ requires newt 1.1.0+ (feature: self-overrides).
+ 1.2.0:
+ 1.1.0: good
+ 1.1.0:
+ 1.1.0: good
+
