Invalidate the diff cache

Because we've tweaked the algorithm that handles intraline difference
and its results are cached in the "diff" cache, we need to force that
evict all entries on the next server restart.  Bumping its key version
is an easy way to do that.

Change-Id: Ic8670ecb136e6da1751245f21c2c7c41220b407d
Signed-off-by: Shawn O. Pearce <sop@google.com>
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/patch/PatchListKey.java b/gerrit-server/src/main/java/com/google/gerrit/server/patch/PatchListKey.java
index cacd5d3..b86a22a 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/patch/PatchListKey.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/patch/PatchListKey.java
@@ -35,7 +35,7 @@
 import javax.annotation.Nullable;
 
 public class PatchListKey implements Serializable {
-  static final long serialVersionUID = 10L;
+  static final long serialVersionUID = 11L;
 
   private transient ObjectId oldId;
   private transient ObjectId newId;