Update to latest esp8266-driver

Deepika · Bartek Szatkowski · commit a4e9a6aedec2 · 2017-08-29T09:54:22.000+01:00
diff --git a/esp8266-driver.lib b/esp8266-driver.lib
@@ -1 +1 @@
-https://github.com/armmbed/esp8266-driver/#cac4d0d8f97745fe9a613b705b406646aeacc3e2
+https://github.com/armmbed/esp8266-driver/#44fb447c72a37fb397a413467e02208ffeddb88e

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-https://github.com/armmbed/esp8266-driver/#cac4d0d8f97745fe9a613b705b406646aeacc3e2`
	`1`	`+https://github.com/armmbed/esp8266-driver/#44fb447c72a37fb397a413467e02208ffeddb88e`