fix outpipe example

Author: James Halliday

readme.markdown

@@ -91,7 +91,7 @@ minification with uglify compression with gzip:
 
 ``` sh
 browserify files/*.js \
-    -p [ ../ -o 'uglifyjs -cm | gzip > bundle/`basename $FILE`.gz' ] \
+    -p [ factor-bundle -o 'uglifyjs -cm | gzip > bundle/`basename $FILE`.gz' ] \
     | uglifyjs -cm | gzip > bundle/common.js.gz
 ```