Update README.md

README.md

@@ -11,6 +11,6 @@ For Building The Plugins
 1. set the right absolute `SystemPath path` to the `openelisglobal` dependence located under the [lib](./lib/) folder
 1. Run the Maven Build  
 
-    ```mvn clen install```
+    ```mvn clean install```
 1. Find the built plugin jars under the `plugins` directory