Revert npmi to 1.x

Fixes #68

Author: RJ Beers

package.json

@@ -8,7 +8,7 @@
         "q": "1.5.0",
         "lodash": "4.17.4",
         "semver": "5.3.0",
-        "npmi": "2.0.1",
+        "npmi": "1.0.1",
         "tmp": "0.0.31",
         "commander": "2.11.0",
         "optimist": "0.6.1",