Add missing serialVersionUID.

Author: nedtwigg

lib/src/main/java/com/diffplug/spotless/npm/EslintConfig.java

@@ -23,6 +23,8 @@
 import com.diffplug.spotless.FileSignature;
 
 public class EslintConfig implements Serializable {
+	private static final long serialVersionUID = 1L;
+
 	@SuppressWarnings("unused")
 	private final FileSignature.Promised eslintConfigPathSignature;
 	private final String eslintConfigJs;

lib/src/main/java/com/diffplug/spotless/npm/EslintFormatterStep.java

@@ -79,6 +79,7 @@ public static FormatterStep create(Map<String, String> devDependencies, Provisio
 	}
 
 	private static class State extends NpmFormatterStepStateBase implements Serializable {
+		private static final long serialVersionUID = 1L;
 
 		private final EslintConfig origEslintConfig;
 		private EslintConfig eslintConfigInUse;

lib/src/main/java/com/diffplug/spotless/npm/EslintTypescriptConfig.java

@@ -22,6 +22,8 @@
 import com.diffplug.spotless.FileSignature;
 
 public class EslintTypescriptConfig extends EslintConfig {
+	private static final long serialVersionUID = 2L;
+
 	@SuppressWarnings("unused")
 	private final FileSignature.Promised typescriptConfigPathSignature;
 

lib/src/main/java/com/diffplug/spotless/npm/NpmPathResolver.java

@@ -21,6 +21,7 @@
 import java.util.Optional;
 
 public class NpmPathResolver implements Serializable {
+	private static final long serialVersionUID = 1L;
 
 	private final File explicitNpmExecutable;