fix(package): update ipfs-unixfs-importer to version 0.39.6

Closes #2074

Author: greenkeeper[bot]

Diff for: package.json

@@ -120,7 +120,7 @@
     "ipfs-repo": "~0.26.5",
     "ipfs-unixfs": "~0.1.16",
     "ipfs-unixfs-exporter": "~0.36.1",
-    "ipfs-unixfs-importer": "~0.38.5",
+    "ipfs-unixfs-importer": "~0.39.6",
     "ipld": "~0.21.1",
     "ipld-bitcoin": "~0.1.8",
     "ipld-dag-cbor": "~0.13.1",