fix(package): update ky to version 0.15.0

Author: greenkeeper[bot]

package.json

@@ -21,7 +21,7 @@
   "dependencies": {
     "form-data": "^2.5.1",
     "humps": "^2.0.1",
-    "ky": "^0.14.0",
+    "ky": "^0.15.0",
     "ky-universal": "^0.3.0",
     "li": "^1.3.0",
     "query-string": "^6.8.3",