_pickImage = async () => {
        let pickerResult = await ImagePicker.launchImageLibraryAsync({
            allowsEditing: true,
            aspect: [4, 3],
            base64: true
        });

        if (!pickerResult.cancelled){
        this.setState({image: pickerResult.uri});
        await uploadImage(pickerResult.base64);
        }
 };