Use 20 Mhz bandwidth channel for AP (#648)

This is to reduce odd stuff seen during nightly optimization of unifi

platformio.ini

@@ -37,7 +37,7 @@ framework = arduino
 lib_deps =
 	AsyncTCP = https://github.com/pbolduc/AsyncTCP.git@^1.2.0
 	https://github.com/ESPresense/ESPAsyncWebServer.git
-	https://github.com/ESPresense/AsyncWiFiSettings.git#1.0.5
+	https://github.com/ESPresense/AsyncWiFiSettings.git#1.0.6
 	https://github.com/ESPresense/SoftFilters.git
 	https://github.com/ESPresense/NimBLE-Arduino.git
 	marvinroger/AsyncMqttClient@^0.9.0

src/main.cpp

@@ -215,6 +215,7 @@ void setupNetwork() {
 #ifdef VERSION
     Serial.println("Version:      " + String(VERSION));
 #endif
+    Serial.printf("WiFi BSSID:   %s (channel=%d rssi=%d)\n", WiFi.BSSIDstr().c_str(), WiFi.channel(), WiFi.RSSI());
     Serial.print("IP address:   ");
     Serial.println(Network.localIP());
     Serial.print("DNS address:  ");