fix(package): update cross-spawn to version 7.0.2

Closes #145

Author: greenkeeper[bot]

package.json

@@ -30,7 +30,7 @@
   "homepage": "https://github.com/observing/pre-commit",
   "license": "MIT",
   "dependencies": {
-    "cross-spawn": "^5.0.1",
+    "cross-spawn": "^7.0.2",
     "spawn-sync": "^1.0.15",
     "which": "1.2.x"
   },