Update README.md - typo

2018-03-10 12:44:17 +01:00 · 2018-03-10 12:44:17 +01:00 · c834fc89f7
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 ### Joomla integrity and version check script

-This script is usefull to check joomla versions on a webserver. It does also check integrity of joomla core files!
+This script is useful to check joomla versions on a webserver. It does also check integrity of joomla core files!
 All outputs are written to a csv file for better automation.

 #### Usage