fix(package): update file-type to version 12.0.0 (#2176)

Author: greenkeeper[bot]

package.json

@@ -81,7 +81,7 @@
     "debug": "^4.1.0",
     "dlv": "^1.1.3",
     "err-code": "^1.1.2",
-    "file-type": "^11.1.0",
+    "file-type": "^12.0.0",
     "fnv1a": "^1.0.1",
     "fsm-event": "^2.1.0",
     "get-folder-size": "^2.0.0",