Phrase some things better (#154)

Kwpolska · Kwpolska · commit 3235300b3f52 · 2016-07-01T10:42:15.000+02:00
Signed-off-by: Chris Warrick &lt;kwpolska@gmail.com&gt;
diff --git a/v7/upgrade_metadata/README.md b/v7/upgrade_metadata/README.md
@@ -4,6 +4,10 @@ Nikola Metadata Upgrade
 This is a plugin to upgrade metadata in `.meta` files from the old format
 (without descriptions) to the new reST-esque format. It only applies to users
 with two-file posts (`.meta` files alongside text) in the older format (up to 7
-lines of text without any descriptions), used by Nikola before v7.0.0. If you
-need to use this plugin, **you will be warned** by `nikola build` — otherwise,
-there is no need to install it.
+lines of text without any descriptions), used by Nikola before v7.0.0. If this
+is the case on your site, **you will be warned** by `nikola build` — otherwise,
+don’t install this plugin (it won’t do a thing anyway and will only waste disk
+space and load time).
+
+The plugin adds the `nikola upgrade_metadata` command. Remove the plugin
+manually after the upgrade.
