Fix the tests target

Author: jasongrout

packages/base-manager/test/tsconfig.json

@@ -3,9 +3,7 @@
   "compilerOptions": {
     "types": ["mocha"],
     "outDir": "build",
-    "rootDir": "src",
-    "lib": ["dom", "es5", "es2015.promise", "es2015.iterable"],
-    "target": "es5"
+    "rootDir": "src"
   },
   "include": ["src/*"],
   "references": [