fix(package): update cross-spawn to version 7.0.3

Closes #126

Author: greenkeeper[bot]

package.json

@@ -48,7 +48,7 @@
   },
   "dependencies": {
     "commander": "^2.9.0",
-    "cross-spawn": "^6.0.5",
+    "cross-spawn": "^7.0.3",
     "debug": "^4.1.1",
     "mkdirp": "^0.5.1",
     "q": "^1.5.1",