UPOS for LS can be NUM, not X - for example, first, 1), a)

Author: AngledLuffa

src/edu/stanford/nlp/trees/UniversalPOSMapper.java

@@ -165,7 +165,7 @@ public static void load() {
       {"EX", "PRON"},
       {"FW", "X"},
       {"/^JJ.*$/", "ADJ"},
-      {"LS", "X"},
+      {"LS", "NUM"},
       {"MD", "AUX"},
       {"NNS", "NOUN"},
       {"NNP", "PROPN"},