config.storageDir is no longer present

[alindeman]

Fixes:

TypeError: Path must be a string. Received undefined
    at assertPath (path.js:8:11)
    at Object.posix.join (path.js:479:5)
    at Object.extract [as fetch] (/usr/local/lib/node_modules/ied/lib/git.js:93:29)
    at MergeMapSubscriber.fetchWithRetry [as project] (/usr/local/lib/node_modules/ied/lib/install.js:633:28)
    at MergeMapSubscriber._tryNext (/usr/local/lib/node_modules/ied/node_modules/rxjs/operator/mergeMap.js:110:27)
    at MergeMapSubscriber._next (/usr/local/lib/node_modules/ied/node_modules/rxjs/operator/mergeMap.js:100:18)
    at MergeMapSubscriber.Subscriber.next (/usr/local/lib/node_modules/ied/node_modules/rxjs/Subscriber.js:89:18)
    at DistinctSubscriber._next (/usr/local/lib/node_modules/ied/node_modules/rxjs/operator/distinct.js:75:26)
    at DistinctSubscriber.Subscriber.next (/usr/local/lib/node_modules/ied/node_modules/rxjs/Subscriber.js:89:18)
    at RefCountSubscriber.Subscriber._next (/usr/local/lib/node_modules/ied/node_modules/rxjs/Subscriber.js:125:26)

[alexanderGugel]

Yup, thanks!