docs(toast): fix parameter type (#230)
docs(toast): fix parameter type (#230)

In the usage example the duration was displayed as a number instead of the actual string parameter.
klirix/ionic-native,ramonornela/ionic-native,xueron/ionic-native,klirix/ionic-native,xueron/ionic-native,driftyco/ionic-native,klirix/ionic-native,ramonornela/ionic-native,ramonornela/ionic-native,xueron/ionic-native,xueron/ionic-native,driftyco/ionic-native,driftyco/ionic-native,ramonornela/ionic-native