Update package.json (#63)

Author: devlato

package.json

@@ -1,6 +1,6 @@
 {
   "name": "async-wait-until",
-  "version": "2.0.18",
+  "version": "2.0.19",
   "description": "Waits until the given predicate function returns a truthy value, then resolves",
   "main": "dist/index.js",
   "module": "./dist/index.esm.js",
@@ -28,6 +28,7 @@
     "release": "npm run lint:ci && npm run test:ci && npm run build:ci && npm run test:integration && npm run docs:ci",
     "prepublishOnly": "npm run clean && npm run release"
   },
+  "sideEffects": false,
   "repository": {
     "type": "git",
     "url": "git+https://github.com/devlato/async-wait-until.git"