Add 'Try it!' for GitLab API

Author: IvanGoncharov

README.md

@@ -19,7 +19,7 @@ If you are interested in GraphQL in general, check out [awesome-graphql](https:/
 | EtMDB | Ethiopian Movie Database | [Try it!](https://etmdb.com/graphql?query=%7B%0A%20%20allCinemaDetails(before%3A%20%222017-10-04%22%2C%20after%3A%20%222010-01-01%22)%20%7B%0A%20%20%20%20edges%20%7B%0A%20%20%20%20%20%20node%20%7B%0A%20%20%20%20%20%20%20%20slug%0A%20%20%20%20%20%20%20%20hallName%0A%20%20%20%20%20%20%7D%0A%20%20%20%20%7D%0A%20%20%7D%0A%7D%0A) | [Docs](https://etmdb.com/api/docs/)
 | Gdom | DOM Traversing and Scraping using GraphQL | [Try it!](http://gdom.graphene-python.org/graphql?query=%7B%0A++page%28url%3A%22http%3A%2F%2Fnews.ycombinator.com%22%29+%7B%0A++++items%3A+query%28selector%3A%22tr.athing%22%29+%7B%0A++++++rank%3A+text%28selector%3A%22td+span.rank%22%29%0A++++++title%3A+text%28selector%3A%22td.title+a%22%29%0A++++++sitebit%3A+text%28selector%3A%22span.comhead+a%22%29%0A++++++url%3A+attr%28selector%3A%22td.title+a%22%2C+name%3A%22href%22%29%0A++++++attrs%3A+next+%7B%0A+++++++++score%3A+text%28selector%3A%22span.score%22%29%0A+++++++++user%3A+text%28selector%3A%22a%3Aeq%280%29%22%29%0A+++++++++comments%3A+text%28selector%3A%22a%3Aeq%282%29%22%29%0A++++++%7D%0A++++%7D%0A++%7D%0A%7D) | [Repo](https://github.com/syrusakbary/gdom)
 | GitHub | Web-based Git repository hosting service | [Try it!](https://developer.github.com/v4/explorer/) | [Docs](https://developer.github.com/v4/)
-| GitLab | Host-your-own Git repository hosting service | | [Docs](https://docs.gitlab.com/ee/api/graphql/)
+| GitLab | Host-your-own Git repository hosting service | [Try it!](https://gitlab.com/-/graphql-explorer) | [Docs](https://docs.gitlab.com/ee/api/graphql/)
 | GraphLoc  | Find a geolocation of an IP address including latitude, longitude, city, country, time zone and area code. Free to use, SSL supported | [Try it!](https://graphloc.com) | [Docs](https://www.graphloc.com)
 | GraphQL Community Graph | This is an Graph Database full of activity of the GraphQL community, including Twitter, StackOverflow, GitHub, Meetups, Slack. | [Try it!](https://graphql.communitygraph.org/graphiql/) | [Repo](https://github.com/neo4j-graphql/graphql-community)
 | GraphQL Europe | Europe's first GraphQL conference | [Try it!](https://api.graphql-europe.org/?query=%7B%0A%20%20conferences%20%7B%0A%20%20%20%20name%0A%20%20%20%20year%0A%20%20%7D%0A%7D) |