Add serialVersionUID to exceptions.

Author: Capstan

Diff for: build.gradle

@@ -97,7 +97,7 @@ task sourcesJar(type: Jar, dependsOn: classes) {
 allprojects {
     gradle.projectsEvaluated {
         tasks.withType(JavaCompile) {
-            options.compilerArgs << "-Xlint:all" << "-Xlint:-serial"<< "-Werror"
+            options.compilerArgs << "-Xlint:all" << "-Werror"
         }
         tasks.withType(Javadoc) {
             options.addStringOption('Xwerror', '-quiet')

Diff for: src/main/java/com/github/fge/compiler/CompilingException.java

@@ -7,6 +7,8 @@
 public final class CompilingException
     extends ProcessingException
 {
+    private static final long serialVersionUID = -1392370773447805892L;
+
     public CompilingException(final ProcessingMessage message)
     {
         super(message);

Diff for: src/main/java/com/github/fge/jsonschema2pojo/UnsupportedVersionException.java

@@ -6,6 +6,8 @@
 public final class UnsupportedVersionException
     extends ProcessingException
 {
+    private static final long serialVersionUID = -1629731636752469256L;
+
     public UnsupportedVersionException()
     {
         super("only draft v3 is supported");