Add org.eclipse.ltk.core.refactoring.prefs to .gitignore

Change-Id: I4c8c2f76cefd7fbcb3f208cc39e33fc5b67e28bd
diff --git a/.gitignore b/.gitignore
index b979660..1b4c29c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 /.project
 /.settings/org.maven.ide.eclipse.prefs
 /.settings/org.eclipse.m2e.core.prefs
+/.settings/org.eclipse.ltk.core.refactoring.prefs
 /test_site
 /.idea
 /gerrit-parent.iml