Do not discard the root exception when things go wrong

The root exception can detail an important root cause. For
example with native-images it can indicate a flag you need
to set for the native-image to compile correctly:
Caused by: java.net.MalformedURLException:
  Accessing an URL protocol that was not enabled. The URL
  protocol http is supported but not enabled by default.
  It must be enabled by adding the -H:EnableURLProtocols=http
  option to the native-image command.

spring-cloud-config-client/src/main/java/org/springframework/cloud/config/client/ConfigClientProperties.java

@@ -336,7 +336,7 @@ public class ConfigClientProperties {
 			return result;
 		}
 		catch (MalformedURLException e) {
-			throw new IllegalStateException("Invalid URL: " + uri);
+			throw new IllegalStateException("Invalid URL: " + uri, e);
 		}
 	}