Bump grapher version

Author: theodorDiaconu

package.js

@@ -19,7 +19,7 @@ Package.onUse(function(api) {
         'check',
         'reactive-var',
         '[email protected]',
-        'cultofcoders:grapher@1.2.8_1',
+        'cultofcoders:grapher@1.3.9_3',
         'tmeasday:[email protected]',
     ]);