async setDisplayName(displayName) {
        const couldSet = await this.pupPage.evaluate(async displayName => {
            if(!window.Store.Conn.canSetMyPushname()) return false;
            await window.Store.Settings.setPushname(displayName);
            return true;
        }, displayName);

        return couldSet;
    }
Sets the current user's display name. 
This is the name shown to WhatsApp users that have not added you as a contact beside your number in groups and in your profile.
@param {string} displayName New display name
@returns {Promise<Boolean>}