Unpin graphql package (#1010)

Pinning graphql is causing duplicated versions to exist in projects that have graphql as a dependency. Unpin to prevent this duplication.

This update caused some issues with dependency installation until the package-lock file was
removed. The following install necessitated a couple minor changes:

* Match pinned core-js dependency, update package-lock. Update usage of core-js.
* Update snapshot

Author: trevor-scheer

CHANGELOG.md

@@ -5,9 +5,11 @@
 - `apollo`
   - Support validation parameters for service:check [#953](https://github.com/apollographql/apollo-tooling/pull/953)
   - Leverage nullability of validation parameters [#1006](https://github.com/apollographql/apollo-tooling/pull/1006)
+  - Unpin graphql version [#1010](https://github.com/apollographql/apollo-tooling/pull/1010)
 - `apollo-language-server`
   - Better error handling in ApolloEngineClient [#953](https://github.com/apollographql/apollo-tooling/pull/953)
   - Fix language server mis-reporting client identity for schema loading operation [#940](https://github.com/apollographql/apollo-tooling/pull/940)
+  - Unpin graphql version [#1010](https://github.com/apollographql/apollo-tooling/pull/1010)
 - `vscode-apollo`
   - Fix inline graphql highlighting in Vue `<script>` tags [#981](https://github.com/apollographql/apollo-tooling/pull/981)
   - Fix graphql comments not being highlighted correctly [#907](https://github.com/apollographql/apollo-tooling/pull/907)