fixed typo

jakewmeyer · jakewmeyer · commit df0584d0b63f · 2017-06-22T23:13:45.000-05:00
diff --git a/data/dragon.rb b/data/dragon.rb
@@ -15,7 +15,7 @@
     }
   },
   heat_shield: {
-    material: PICA-X,
+    material: 'PICA-X',
     size_meters: 3.6,
     temp_degrees: 3000,
     dev_partner: NASA
