added version info

src/main.cpp

@@ -3,6 +3,8 @@
 
 #include "WifiManager.h"
 
+#define VERSION "v1.0"
+
 bool allow;
 bool error = false;
 
@@ -133,6 +135,8 @@ void setup() {
 
     Serial.begin(9600);
     Serial.println("\n\n\n\nstartup of ESP");
+    Serial.print("Version: ");
+    Serial.println(VERSION);
 
 
     //initial measurement of water state