Fix #315 - Add mapping for create-react-app webpack:///src.

Wanted to add the ability to have multiple mappings for the same pattern and select one that matches what's on disk, but I don't actually like having that much smartness.

src/chromeDebugAdapter.ts

@@ -18,6 +18,7 @@ const DefaultWebSourceMapPathOverrides: ISourceMapPathOverrides = {
     'webpack:///./*': '${webRoot}/*',
     'webpack:///*': '*',
     'meteor://💻app/*': '${webRoot}/*',
+    'webpack:///src/*': '${webRoot}/*'
 };
 
 export class ChromeDebugAdapter extends CoreDebugAdapter {