Adapt code to API change in Gerrit core

The methods in PluginConfigFactory were renamed by [1].

[1] https://gerrit-review.googlesource.com/51233

Change-Id: I58c44ec164cafe3d64e41eee734dc14971a78855
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
diff --git a/src/main/java/com/googlesource/gerrit/plugins/reviewersbyblame/RefUpdateListener.java b/src/main/java/com/googlesource/gerrit/plugins/reviewersbyblame/RefUpdateListener.java
index 9d2474f..f40cdfe 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/reviewersbyblame/RefUpdateListener.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/reviewersbyblame/RefUpdateListener.java
@@ -89,7 +89,7 @@
     int maxReviewers;
     try {
       maxReviewers =
-          cfg.getWithInheritance(projectName, pluginName)
+          cfg.getFromProjectConfigWithInheritance(projectName, pluginName)
              .getInt("maxReviewers", 3);
     } catch (NoSuchProjectException x) {
       log.error(x.getMessage(), x);