Update readme with color_identity

Andrew Backes · Andrew Backes · commit 5c9e41dc2321 · 2017-07-08T23:37:34.000-05:00
diff --git a/README.md b/README.md
@@ -40,6 +40,7 @@ Import (Card and Set will be most used)
     mana_cost
     cmc
     colors
+    color_identity
     type
     supertypes
     subtypes
