Add ToDos to the schematic

Several issues were found after receiving the PCBs that should be
rectified for the next version.

weather-sensor/hardware/weather_station_sensor.sch

 Wire Wire Line
 	6050 4500 6150 4500
 Text Notes 2850 7250 0    50   ~ 0
-TODO: other diode in 0603 package
+TODO: change diode to 0804 package
 $Comp
 L Device:D_Zener D1
 U 1 1 5E5B4A6A
 	1    3700 6300
 	1    0    0    -1  
 $EndComp
+Text Notes 7350 6250 0    50   ~ 0
+TODO: connect pins 4,5,6 to\nground instead of vcc
+Text Notes 9600 1600 0    50   ~ 0
+TODO: remove copper plating in the\nradiation direction of the antenna
 $EndSCHEMATC