Merge branch 'bugfix/fix_sniffer_lost' into 'master'

Fix PWM lost when using PWM

See merge request sdk/ESP8266_RTOS_SDK!713

Author: donghengqaz

components/esp8266/lib/VERSION

@@ -1,7 +1,7 @@
 gwen:
     core:       5550687
     net80211:   8a7bbdb
-    pp:         957ad08
+    pp:         7a71e86
     wpa:        4e2372f
     espnow:     eeb16c6
     wps:        4e2372f