.gitignore in cat_tree-0.0.2 vs .gitignore in cat_tree-1.0.0

@@ -5,12 +5,7 @@
 /coverage/
 /doc/
 /pkg/
 /spec/reports/
 /tmp/
-*.bundle
-*.so
-*.o
-*.a
-mkmf.log
-bundle
 gemfiles/*.lock
+*.gem