v0.6.0 breaks import functionality (working in v0.5.2)

I upgraded the nxplorerJS project to v0.6.0 and got the following error

```
Syntax Error: Unexpected

GraphQL request (2:1)
1:
2:
^
22 | // Create GraphQL Schema with all the pieces in place
23 | export const setupSchema = (): GraphQLSchema => {
> 24 | const schema = makeExecutableSchema({
25 | typeDefs,
26 | resolvers: resolvers,
27 | schemaDirectives: {
```

Here is the travis build reference https://travis-ci.org/ERS-HCL/nxplorerjs-microservice-starter/jobs/382177481

This appears to be related to https://github.com/prismagraphql/graphql-import/issues/45 but when I added a dummy type the wildcard imports do not get imported properly

* Code reference: https://github.com/ERS-HCL/nxplorerjs-microservice-starter
* Main schema file: https://github.com/ERS-HCL/nxplorerjs-microservice-starter/blob/master/server/graphql/schema/main.graphql
* Schema setup file: https://github.com/ERS-HCL/nxplorerjs-microservice-starter/blob/master/server/graphql/setupSchema.ts

Code snippet
```
const typeDefs = importSchema('server/graphql/schema/main.graphql');
...
export const setupSchema = (): GraphQLSchema => {
const schema = makeExecutableSchema({
typeDefs,
resolvers: resolvers,
schemaDirectives: {
date: FormattableDateDirective,
auth: AuthDirective
}
});
```

main.graphql
```
# import * from "./starwars.graphql"
# import * from "./example.graphql"
# import * from "./user.graphql"
# import * from "./movie.graphql"
# import * from "./blog.graphql"
# import * from "./schema.graphql"
```

Start with server/graphql/schema/main.graphql and server/graphql/setupSchema.ts, then reproduce the importSchema failure against the v0.6.0 behavior described in the issue. Compare wildcard imports with v0.5.2 and inspect the linked graphql-import issue for context. Done means the listed schema imports parse successfully and setupSchema builds the executable schema without the EOF error.

Written by the indexing model from the issue text.