feat: classify webFrameMain (#175)

Adds a class required for electron/electron#25464 to import `webFrameMain`.

Author: samuelmaddock

src/master-interfaces.ts

@@ -24,6 +24,8 @@ export const generateMasterInterfaces = (
         return 'nativeImage';
       case 'webcontents':
         return 'webContents';
+      case 'webframemain':
+        return 'webFrameMain';
       default:
         return moduleName;
     }