fix(package): update @semantic-release/exec to version 3.0.1

Closes #57

Author: greenkeeper[bot]

package.json

@@ -18,7 +18,7 @@
   "dependencies": {
     "@semantic-release/changelog": "^3.0.0",
     "@semantic-release/error": "^2.1.0",
-    "@semantic-release/exec": "^2.3.0",
+    "@semantic-release/exec": "^3.0.1",
     "@semantic-release/git": "^7.0.0",
     "@semantic-release/github": "^5.0.0",
     "@semantic-release/npm": "^4.0.0",