Deprecate building:level (close #96)

data/deprecated.json

@@ -367,6 +367,10 @@
     "old": {"building:height": "*"},
     "replace": {"height": "$1"}
   },
+  {
+    "old": {"building:level": "*"},
+    "replace": {"building:levels": "$1"}
+  },
   {
     "old": {"building:material": "Brick"},
     "replace": {"building:material": "brick"}