Fix weeks not support in reminder command (#1977)

Author: ekzyis

lib/time.js

@@ -23,11 +23,11 @@ export function timeSince (timeStamp) {
 }
 
 export function datePivot (date,
-  { years = 0, months = 0, days = 0, hours = 0, minutes = 0, seconds = 0, milliseconds = 0 }) {
+  { years = 0, months = 0, weeks = 0, days = 0, hours = 0, minutes = 0, seconds = 0, milliseconds = 0 }) {
   return new Date(
     date.getFullYear() + years,
     date.getMonth() + months,
-    date.getDate() + days,
+    date.getDate() + days + weeks * 7,
     date.getHours() + hours,
     date.getMinutes() + minutes,
     date.getSeconds() + seconds,