prepare 2.18.2 release (#37)

Author: LaunchDarklyCI

package-lock.json

@@ -53,7 +53,7 @@
     "tslint": "^5.19.0",
     "tslint-config-prettier": "^1.18.0",
     "tslint-plugin-prettier": "^2.0.1",
-    "typescript": "^3.9.2"
+    "typescript": "~3.8.3"
   },
   "dependencies": {
     "launchdarkly-js-client-sdk": "2.17.5",