Merge pull request #7706 from mszczepanczyk/master

Add weeks(), asWeeks() methods to Duration interface

moment/moment-node.d.ts

@@ -99,6 +99,9 @@ declare module moment {
         days(): number;
         asDays(): number;
 
+        weeks(): number;
+        asWeeks(): number;
+
         months(): number;
         asMonths(): number;