Updated dropped dependencies, allowing npm install to function.

Author: coreybutler

package.json

@@ -39,10 +39,10 @@
     "babel-plugin-istanbul": "^4.1.5",
     "babel-preset-env": "^1.6.1",
     "babel-register": "^6.16.3",
-    "chai": "^3.5.0",
+    "chai": "^4.2.0",
     "chai-as-promised": "^7.1.1",
-    "chai-iterator": "^1.1.1",
-    "chai-string": "^1.3.0",
+    "chai-iterator": "^3.0.2",
+    "chai-string": "^1.5.0",
     "codecov": "^3.0.0",
     "cross-env": "^5.1.3",
     "form-data": "^2.3.1",
@@ -60,10 +60,10 @@
   },
   "dependencies": {
     "web-streams-polyfill": "^2.1.1",
-    "busboy": "^0.3.0",
-    "formdata-node": "^1.5.1"
+    "busboy": "^0.3.1",
+    "formdata-node": "^2.4.0"
   },
   "peerDependencies": {
-    "form-data": ">= 2.1.0"
+    "form-data": ">=3.0.0"
   }
 }