Mention the bevy_wgpu plugin

Author: MinerSebas

crates/bevy_render/src/lib.rs

@@ -229,6 +229,8 @@ impl Plugin for RenderPlugin {
 
 fn check_for_render_resource_context(context: Option<Res<Box<dyn RenderResourceContext>>>) {
     if context.is_none() {
-        panic!("bevy_render couldn't find a render backend. Try adding bevy_wgpu!")
+        panic!(
+            "bevy_render couldn't find a render backend. Perhaps try adding the bevy_wgpu plugin!"
+        )
     }
 }