use env_logger in all examples (#2934)

examples/svg/Cargo.toml

@@ -13,3 +13,4 @@ eframe = { path = "../../crates/eframe", features = [
     "__screenshot", # __screenshot is so we can dump a screenshot using EFRAME_SCREENSHOT_TO
 ] }
 egui_extras = { path = "../../crates/egui_extras", features = ["svg"] }
+env_logger = "0.10"

examples/svg/src/main.rs

@@ -7,6 +7,7 @@
 use eframe::egui;
 
 fn main() -> Result<(), eframe::Error> {
+    env_logger::init(); // Log to stderr (if you run with `RUST_LOG=debug`).
     let options = eframe::NativeOptions {
         initial_window_size: Some(egui::vec2(1000.0, 700.0)),
         ..Default::default()