chore: update dependency formidable to 1.2.2

Bumping formidable to version 1.2.2 fixes the error with the
crash uploads:

TypeError [ERR_INVALID_ARG_TYPE]:
The "offset" argument must be of type number. Received type string

package.json

@@ -16,7 +16,7 @@
     "dirty": "0.9.7",
     "express": "^4.14.1",
     "express-json": "^1.0.0",
-    "formidable": "~1.0.14",
+    "formidable": "~1.2.2",
     "fs-plus": "0.10.0",
     "github-releases": "0.1.x",
     "glob": "3.x",