Added expert option section to README.md regarding popcornmix enhance…

…ment for issue Hexxeh#197, PRUNE_MODULES. README updates for PRUNE_MODULES boolean option. Noted setting parameter to non-zero value will enable the pruning
ageek · Nov 13, 2015 · 308dd58 · 308dd58
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@@ -87,6 +87,15 @@ from the specified branch, eg:
 
 will use the 'next' branch.
 
+#### `PRUNE_MODULES`
+
+Allows you to delete unused module directories when doing an update. Set it equal to a non-zero value and it will remove all modules except the latest installed:
+
+    sudo PRUNE_MODULES=1 rpi-update
+
+will remove previously installed module files. Use this option to free disk space used by older module updates.
+
+
 #### Troubleshooting
 
 There are two possible problems related to SSL certificates that may prevent