Remove tslib dependency

Author: surol

package.json

@@ -21,8 +21,7 @@
   "dependencies": {
     "a-iterable": "^2.4.2",
     "call-thru": "^2.5.2",
-    "fun-events": "^5.0.4",
-    "tslib": "^1.10.0"
+    "fun-events": "^5.0.4"
   },
   "devDependencies": {
     "@types/jest": "^24.0.18",