Remove need to supply webhook avatar

README.md

@@ -17,7 +17,6 @@ You'll need rustc and cargo for compilation. To run, you'll need Python 3 still
 6. Run migrations: `sqlx migrate run`.
 7. Set environment variables:
    * `DATABASE_URL` - the URL of your MySQL database (`mysql://user[:password]@domain/database`)
-   * `WEBHOOK_AVATAR` - accepts the name of an image file located in `$CARGO_MANIFEST_DIR/assets/` to be used as the avatar when creating webhooks. **IMPORTANT: image file must be 128x128 or smaller in size**
 8. Build: `cargo build --release`
 
 ### Compiling for other target