Fixed changelog

Signed-off-by: Mikhail Grigorev <sleuthhound@gmail.com>

Author: cherts

Espressif/changelog.txt

@@ -1,7 +1,7 @@
 Changelog:
 ----------
 
-v2.0.8 (10.08.2015):
+v2.0.8 (01.09.2015):
 + Added Espressif MESH SDK (beta) (folder ESP8266_MESH_SDK);
 * Update SDK v1.3.0 (folder ESP8266_SDK);
 * SDK version 1.2.0 moved to a folder ESP8266_SDK_120;