Update wifimanager to 0.14 (#252)

lib/WiFiManager/examples/OnDemandConfigPortal/OnDemandConfigPortal.ino

@@ -5,7 +5,7 @@
 #include <DNSServer.h>
 #include <WiFiManager.h>          //https://github.com/tzapu/WiFiManager
 
-// select wich pin will trigger the configuraton portal when set to LOW
+// select which pin will trigger the configuration portal when set to LOW
 // ESP-01 users please note: the only pins available (0 and 2), are shared 
 // with the bootloader, so always set them HIGH at power-up
 #define TRIGGER_PIN 0