Fix deps breakage due to missing tslib runtime dependency

Author: pimterry

package-lock.json

@@ -132,6 +132,7 @@
     "os-proxy-config": "^1.1.1",
     "rimraf": "^2.7.1",
     "semver": "^7.2.1",
+    "tslib": "^2.8.1",
     "yargs": "^15.1.0"
   },
   "devDependencies": {
@@ -150,9 +151,8 @@
     "node-fetch": "^2.6.7",
     "targz": "^1.0.1",
     "tsc-watch": "^4.2.9",
-    "tslib": "^1.14.1",
     "tslint": "^5.20.1",
     "tsx": "^4.16.2",
-    "typescript": "^3.8.2"
+    "typescript": "~4.0"
   }
 }