Update JSZip to v2.3.0.
Update JSZip to v2.3.0.

BS3 commits: 0418c7678de442c06cd7b530482151d02e06ee63

aaroncnhk/todc-bootstrap,todc/todc-bootstrap,2947721120/todc-bootstrap,2947721120/googlebt4,up2vs/todc-bootstrap,todc/todc-bootstrap,todc/todc-bootstrap,mozillo/todc-bootstrap,ztx1491/todc-bootstrap