esp8266: README: Typo fix.

a193ced7 · Paul Sokolovsky · c8870b7c · a193ced7
Commit a193ced7 authored Jun 19, 2015 by Paul Sokolovsky
--- a/esp8266/README.md
+++ b/esp8266/README.md
 Micro Python port to ESP8266
 ============================

-This is a highly experimental port of MicroPython for thw WiFi modules based
+This is a highly experimental port of MicroPython for the WiFi modules based
 on Espressif ESP8266 chip.

 WARNING: The port is highly experimental and any APIs are subject to change.