Make AutoDispose ScopeHandlers final

Author: ZacSweers

autodispose/src/main/java/com/uber/autodispose/AutoDispose.java

@@ -166,7 +166,7 @@ public interface ScopeHandler {
     return new LifecycleScopeProviderHandlerImpl(scope);
   }
 
-  private static class MaybeScopeHandlerImpl implements ScopeHandler {
+  private static final class MaybeScopeHandlerImpl implements ScopeHandler {
 
     private final Maybe<?> scope;
 
@@ -196,7 +196,7 @@ public <T> Function<Observable<? extends T>, ObservableSubscribeProxy<T>> forObs
     }
   }
 
-  private static class ScopeProviderHandlerImpl implements ScopeHandler {
+  private static final class ScopeProviderHandlerImpl implements ScopeHandler {
 
     private final ScopeProvider scope;
 
@@ -226,7 +226,7 @@ public <T> Function<Observable<? extends T>, ObservableSubscribeProxy<T>> forObs
     }
   }
 
-  private static class LifecycleScopeProviderHandlerImpl implements ScopeHandler {
+  private static final class LifecycleScopeProviderHandlerImpl implements ScopeHandler {
 
     private final LifecycleScopeProvider<?> scope;