Upgrade unimported to latest

This upgrades an insecure transitive dependency: simple-git

Author: mroderick

package-lock.json

@@ -104,7 +104,7 @@
     "rimraf": "^3.0.2",
     "semver": "^7.3.5",
     "shelljs": "^0.8.4",
-    "unimported": "^1.19.1"
+    "unimported": "^1.20.0"
   },
   "files": [
     "lib",