Add missing serialVersionUID.

Author: nedtwigg

lib/src/main/java/com/diffplug/spotless/java/ExpandWildcardImportsStep.java

@@ -29,6 +29,7 @@
 import com.diffplug.spotless.Provisioner;
 
 public class ExpandWildcardImportsStep implements Serializable {
+	private static final long serialVersionUID = 1L;
 
 	private static final String INCOMPATIBLE_ERROR_MESSAGE = "There was a problem interacting with Java-Parser; maybe you set an incompatible version?";
 	private static final String MAVEN_COORDINATES = "com.github.javaparser:javaparser-symbol-solver-core";
@@ -56,6 +57,7 @@ private State equalityState() {
 	}
 
 	private static class State implements Serializable {
+		private static final long serialVersionUID = 1L;
 
 		private final Collection<File> typeSolverClasspath;
 		private final JarState jarState;