Added meteor package percolate:synced-cron required by LDAP

backgound sync https://github.com/wekan/wekan/pull/2555

Thanks to xet7 !

Related #2354

.meteor/packages

@@ -94,3 +94,4 @@ lamhieu:unblock
 meteorhacks:aggregate@1.3.0
 wekan-markdown
 konecty:mongo-counter
+percolate:synced-cron

.meteor/versions

@@ -137,6 +137,7 @@ peerlibrary:base-component@0.16.0
 peerlibrary:blaze-components@0.15.1
 peerlibrary:computed-field@0.9.0
 peerlibrary:reactive-field@0.5.0
+percolate:synced-cron@1.3.2
 promise@0.11.2
 raix:eventemitter@0.1.3
 raix:handlebar-helpers@0.2.5