README: Fix compilation of code-example

Because the `README` is _intentionally_ included as the root
module/library documentation, its code sample is susceptible to `cargo
tests` doctests.

Author: MarijnS95

README.md

@@ -26,6 +26,6 @@ Call this somewhere at the start of your program (after initializing your logger
 
 ```rust
 use panic_log::Configuration;
-[...]
+// ...
 panic_log::initialize_hook(Configuration::default());
 ```