add log for debug

src/index.js

@@ -136,6 +136,7 @@ async function getData(token, idPCE) {
 async function getActualDailyLoadData() {
   log('debug', 'Retrieve previous daily data')
   const result = await cozyClient.data.findAll('com.grandlyon.grdf.day')
+  log('debug', result)
   return result ? result : []
 }
 
@@ -212,6 +213,9 @@ async function agregateMonthAndYearData(data, previousData) {
       })
       if(filteredPreviousData[0]){
         oldValue = filteredPreviousData[0].load
+        log("debug", "OLDVALUE FOUND")
+        log("debug", oldValue)
+        log("debug", element)
       }
       element.year + '-' + element.month in monthData
         ? (monthData[element.year + '-' + element.month] += element.load - oldValue)