Fix Typescript WebSocket import error
Fix Typescript WebSocket import error

I get the following error when using the apollo-server-core with typescript (3.2.4) :

node_modules/apollo-server-core/dist/types.d.ts:4:8 - error TS1192: Module '"/node_modules/@types/ws/index"' has no default export.
import WebSocket from 'ws';

The change fixes this error!
apollostack/apollo-server