add AsyncPing library to libraries.md (#2889)

fully asynchronous Ping library (have full ping statistic and hardware MAC address).
esp8266 · Feb 20, 2017 · d2b370b · d2b370b
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diff --git a/doc/libraries.md b/doc/libraries.md
@@ -158,3 +158,4 @@ Libraries that don't rely on low-level access to AVR registers should work well.
 - [OLED](https://github.com/klarsys/esp8266-OLED) - a library for controlling I2C connected OLED displays. Tested with 0.96 inch OLED graphics display.
 - [MFRC522](https://github.com/miguelbalboa/rfid) - A library for using the Mifare RC522 RFID-tag reader/writer.
 - [Ping](https://github.com/dancol90/ESP8266Ping) - lets the ESP8266 ping a remote machine.
+- [AsyncPing](https://github.com/akaJes/AsyncPing) - fully asynchronous Ping library (have full ping statistic and hardware MAC address).