Cannot autocomplete types in the same file

## Actual Behavior


## Expected Behavior

I expect to show the suggestion `User` after typing `user: U`, but it only shows the snippet.

## Specifications

- GraphQL for VSCode Extension Version: v0.3.10
- VSCode Version: 1.50.1
- OS Name: arch linux
- OS Version: 5.8.12-arch1-1 graphql/vscode-graphql#1 SMP PREEMPT Sat, 26 Sep 2020 21:42:58 +0000 x86_64 GNU/Linux

## Logs Of TS Server || GraphQL Language Service
```
10/20/2020, 5:49:24 PM [4] (pid: 39049) graphql-language-service-usage-logs: {"type":"usage","messageType":"textDocument/didChange","projectName":"default","fileName":"file:///home/yuanjun/CodeBase/learn_graphql/schema.graphql"}

undefined
10/20/2020, 5:49:24 PM [4] (pid: 39049) graphql-language-service-usage-logs: {"type":"usage","messageType":"textDocument/completion","projectName":"default","fileName":"file:///home/yuanjun/CodeBase/learn_graphql/schema.graphql"}

undefined
10/20/2020, 5:49:24 PM [4] (pid: 39049) graphql-language-service-usage-logs: {"type":"usage","messageType":"textDocument/completion","projectName":"default","fileName":"file:///home/yuanjun/CodeBase/learn_graphql/schema.graphql"}

undefined
```