Add async version of addLocalFile Use open and readFile instead of existsSync and readFileSync. There are still some sync functions left in the Utils.findFiles call, but the impact is minimal compared to the readFileSync.
Add async version of addLocalFile
Use open and readFile instead of existsSync and readFileSync. There
are still some sync functions left in the Utils.findFiles call,
but the impact is minimal compared to the readFileSync.

cthackers/adm-zip