Ignore Eclipse file.
diff --git a/.settings/.gitignore b/.settings/.gitignore
index 1de83a6..d07abf4 100644
--- a/.settings/.gitignore
+++ b/.settings/.gitignore
@@ -1,3 +1,4 @@
 /org.eclipse.core.resources.prefs
 /org.eclipse.jdt.core.prefs
 /org.eclipse.m2e.core.prefs
+/org.eclipse.pde.core.prefs