feat(node): support for node 14+ (#60)

Author: NathanWalker

package.json

@@ -50,7 +50,7 @@
     "lodash": "4.17.15",
     "osenv": "0.1.3",
     "semver": "5.5.1",
-    "shelljs": "0.7.6",
+    "shelljs": "~0.8.4",
     "temp": "0.8.3",
     "winreg": "1.2.2",
     "yauzl": "2.10.0"