fix minor bug that prevents most revent devel versions from communicating with app

RX_FSK/RX_FSK.ino

@@ -2120,7 +2120,7 @@ void loopDecoder() {
     if (*typestr == 0) typestr = sondeTypeStr[s->type];
     // TODO: only if GPS is valid...
     if (gpsPos.valid) {
-      snprintf(gps, 128, ", \"gpslat\": %f"
+      snprintf(gps, 128, ", \"gpslat\": %f,"
                "\"gpslon\": %f,"
                "\"gpsalt\": %d,"
                "\"gpsacc\": %d,"

RX_FSK/version.h

@@ -1,4 +1,4 @@
 const char *version_name = "rdzTTGOsonde";
-const char *version_id = "devel20210315";
+const char *version_id = "devel20210316";
 const int SPIFFS_MAJOR=2;
 const int SPIFFS_MINOR=10;