Add typing for ST3 (python 3.3)

fixes #582

required by mdpopups 4.3+

Author: deathaxe

dependencies.json

@@ -1,6 +1,10 @@
 {
     "*": {
-        "*": [
+        "<4000": [
+            "mdpopups",
+            "typing"
+        ],
+        ">=4000": [
             "mdpopups"
         ]
     }