Bump apollo-link-ws from 1.0.17 to 1.0.18 (parse-community#5699)

Bumps [apollo-link-ws](https://github.com/apollographql/apollo-link) from 1.0.17 to 1.0.18.
- [Release notes](https://github.com/apollographql/apollo-link/releases)
- [Changelog](https://github.com/apollographql/apollo-link/blob/master/CHANGELOG.md)
- [Commits](https://github.com/apollographql/apollo-link/compare/apollo-link-ws@1.0.17...apollo-link-ws@1.0.18)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -64,7 +64,7 @@
     "apollo-client": "2.5.1",
     "apollo-link": "1.2.11",
     "apollo-link-http": "1.5.14",
-    "apollo-link-ws": "1.0.17",
+    "apollo-link-ws": "1.0.18",
     "apollo-upload-client": "10.0.0",
     "apollo-utilities": "1.2.1",
     "babel-eslint": "10.0.2",