Inline sources contents in source map files

Author: Alexandre Kirszenberg

CHANGELOG.md

@@ -16,6 +16,8 @@
   [@renatorib](https://github.com/renatorib) in [#761](https://github.com/apollographql/subscriptions-transport-ws/pull/761)
 - Destructure the correct error object in `MessageTypes.GQL_START`.  <br/>
   [@gregbty](https://github.com/gregbty) in [#588](https://github.com/apollographql/subscriptions-transport-ws/pull/588)
+- Inline source in sourcemap files to fix broken source lookups.  <br/>
+  [@alexkirsz](https://github.com/alexkirsz) in [#513](https://github.com/apollographql/subscriptions-transport-ws/pull/513)
 
 ### New Features
 

tsconfig.json

@@ -4,6 +4,7 @@
     "module": "commonjs",
     "moduleResolution": "node",
     "sourceMap": true,
+    "inlineSources": true,
     "noImplicitAny": true,
     "rootDir": "./src",
     "outDir": "./dist",