updated package.json to accept a more recent firmata.js version
updated package.json to accept a more recent firmata.js version

jguille2/Snap4Arduino,jguille2/Snap4Arduino,bromagosa/Snap4Arduino,edutec/Snap4Arduino,jguille2/Snap4Arduino,bromagosa/Snap4Arduino,bromagosa/Snap4Arduino,bromagosa/Snap4Arduino,edutec/Snap4Arduino,jguille2/Snap4Arduino,edutec/Snap4Arduino