Add DataStructures to REQUIRE

sswatson · sswatson · commit ce1ad08019ad · 2018-02-28T15:00:04.000-05:00
diff --git a/REQUIRE b/REQUIRE
@@ -2,4 +2,5 @@ julia 0.6.2
 Colors
 Requires
 ProgressMeter
-Cairo
+Cairo
+DataStructures
