Update MicroPython to latest official release

code/README.md

@@ -30,8 +30,8 @@ The Wemos D1 mini requires a driver for Mac OS X to drive the CH340 serial bridg
   * For Linux/macOS, this will be something like `/dev/ttyUSB0`
 2. From this directory (the one containing `Pipfile`), run the following command to clear the ESP8266's flash memory: `pipenv run esptool --port <port> erase_flash`
 3. Flash the MicroPython firmware onto the ESP8266. This will vary slightly depending on your board.
-  * In most cases, flashing with the default quad-I/O mode will work fine: `pipenv run esptool --port <port> --baud 460800 write_flash --flash_size detect 0 MicroPython/esp8266-20180511-v1.9.4.bin`
-  * For some boards, it is necessary to fall back to the dual-I/O mode: `pipenv run esptool --port <port> --baud 460800 write_flash --flash_size detect --flash_mode dio 0 MicroPython/esp8266-20180511-v1.9.4.bin`
+  * In most cases, flashing with the default quad-I/O mode will work fine: `pipenv run esptool --port <port> --baud 460800 write_flash --flash_size detect 0 MicroPython/esp8266-20190529-v1.11.bin`
+  * For some boards, it is necessary to fall back to the dual-I/O mode: `pipenv run esptool --port <port> --baud 460800 write_flash --flash_size detect --flash_mode dio 0 MicroPython/esp8266-20190529-v1.11.bin`
 
 ### Copying files to the device