Fix esp8266 compilation failed

bump version

Author: luc-github

esp3d/src/include/version.h

@@ -22,7 +22,7 @@
 #define _VERSION_ESP3D_H
 
 //version and sources location
-#define FW_VERSION "3.0.0.a206"
+#define FW_VERSION "3.0.0.a207"
 #define REPOSITORY "https://github.com/luc-github/ESP3D/tree/3.0"
 
 #endif //_VERSION_ESP3D_H

esp3d/src/modules/serial/serial_service.cpp

@@ -157,8 +157,8 @@ bool SerialService::begin(uint8_t serialIndex)
         Serials[_serialIndex]->setRxBufferSize (SERIAL_RX_BUFFER_SIZE);
 #ifdef ARDUINO_ARCH_ESP8266
         Serials[_serialIndex]->begin(br, ESP_SERIAL_PARAM, SERIAL_FULL, (_txPin == -1)?1:_txPin);
-        if (_rx != -1) {
-            Serials[_serialIndex]->pins((_txPin == -1)?1:_txPin, _rxPin)
+        if (_rxPin != -1) {
+            Serials[_serialIndex]->pins((_txPin == -1)?1:_txPin, _rxPin);
         }
 
 #endif //ARDUINO_ARCH_ESP8266