.gitignore in bcrypt4-4.0.1 vs .gitignore in bcrypt4-4.0.2

@@ -1,10 +1,13 @@
-doc
-pkg
-tmp
+/doc
+/pkg
+/tmp
+/vendor
+
 *.o
 *.bundle
 *.so
 *.jar
+*.gem
+
 .DS_Store
 .rbenv-gemsets
-*.gem