Version bump + write version at startup if needed

src/Config.cpp

@@ -51,7 +51,11 @@ namespace config {
 
 		void setup() {
 			details::read();
-			//details::write();
+
+			if(strcasecmp_P(value.version, PSTR(VERSION))) {
+				strcpy_P(value.version, PSTR(VERSION));
+				details::write();
+			}
 		}
 
 		void save() {

src/config/System.h

@@ -20,7 +20,7 @@
  \def VERSION
  Version string, only used for indicative purpose
  */
-#define VERSION "1.20"
+#define VERSION "1.21"
 
 
 /**