fix a typo

Author: gaocegege

readme.md

@@ -8,6 +8,8 @@ WIP now.
 
 ### Editor
 
+Change `processing.modes` in build.xml, and run `ant install`, you will get a mode in your `processing.modes`.
+
 <img src="./docs/img/editor.png" width="600">
 
 <img src="./docs/img/demo.gif" width="600">

src/rprocessing/mode/RLangEditor.java

@@ -130,7 +130,7 @@ public JMenu buildHelpMenu() {
 
             @Override
             public void actionPerformed(final ActionEvent e) {
-                Platform.openURL("http://github.com/gaocegege/Rrocessing.R");
+                Platform.openURL("http://github.com/gaocegege/Processing.R");
             }
         }));
         return menu;