Update core_version.h

Author: Jason2866

cores/esp8266/core_version.h

@@ -1,12 +1,4 @@
-#ifndef ARDUINO_ESP8266_GIT_VER
-#define ARDUINO_ESP8266_GIT_VER 0x00000000
-#endif
-
-#ifndef ARDUINO_ESP8266_GIT_DESC
-#define ARDUINO_ESP8266_GIT_DESC unspecified
-#endif
-
-// ARDUINO_ESP8266_RELEASE is defined for released versions as a string containing the version name, i.e. "2_3_0_RC1"
-// ARDUINO_ESP8266_RELEASE is used in the core internally. Please use ESP.getCoreVersion() function instead.
-
-// ARDUINO_ESP8266_RELEASE_<version number> are defined for releases, for use in #ifdef... constructs
+#define ARDUINO_ESP8266_GIT_VER 0x2843a5ac
+#define ARDUINO_ESP8266_GIT_DESC 2.7.3-3-g2843a5ac
+#define ARDUINO_ESP8266_RELEASE_2_7_4
+#define ARDUINO_ESP8266_RELEASE "2_7_4"