added vim undo files to gitignore

Roberto De Ioris · Roberto De Ioris · commit cc924f5faf4c · 2017-06-07T22:35:18.000+02:00
diff --git a/.gitignore b/.gitignore
@@ -91,3 +91,4 @@ ENV/
 Binaries/
 python35/
 python27/
+*.un~
