add super key to allow for rebuilds

[abdelaziz-mahdy]

using the package i had two pages with diffrent text controllers but same ui widget but the key not being available doesnt allow rebuild to occur

fix

const EasyAutocomplete(
      {Key? key,
      this.suggestions,
      this.asyncSuggestions,
      this.suggestionBuilder,
      this.progressIndicatorBuilder,
      this.controller,
      this.decoration = const InputDecoration(),
      this.onChanged,
      this.onSubmitted,
      this.inputFormatter = const [],
      this.initialValue,
      this.autofocus = false,
      this.textCapitalization = TextCapitalization.sentences,
      this.keyboardType = TextInputType.text,
      this.focusNode,
      this.cursorColor,
      this.inputTextStyle = const TextStyle(),
      this.suggestionTextStyle = const TextStyle(),
      this.suggestionBackgroundColor,
      this.debounceDuration = const Duration(milliseconds: 400),
      this.validator})
      : assert(onChanged != null || controller != null,
            'onChanged and controller parameters cannot be both null at the same time'),
        assert(!(controller != null && initialValue != null),
            'controller and initialValue cannot be used at the same time'),
        assert(
            suggestions != null && asyncSuggestions == null ||
                suggestions == null && asyncSuggestions != null,
            'suggestions and asyncSuggestions cannot be both null or have values at the same time'),
        super(key: key);