Init event struct (#84)

Fixing events showing on the 0th day.

Author: Ingurum

examples/Inkplate10/Projects/Google_calendar_example/Google_Calendar_Example.ino

@@ -76,7 +76,7 @@ struct entry
     char name[128];
     char time[128];
     char location[128];
-    int day;
+    int day = -1;
     int timeStamp;
 };