Update processing link

Author: robertpoll

README.md

@@ -35,4 +35,4 @@ It should not be possible to send a GCode that overstretches the arm, or causes
 [Source code](Python/HelloWorld.py#L1) for a very simple example can be downloaded from [here](../../raw/master/Python/HelloWorld.py). The example works with Python 2.7 and Python 3, but Python 3 is preferred.
 
 ### Simple Processing Example
-[Source code](Processing/HelloWorld/HelloWorld.pde#L1) for a very simple example can be downloaded from [here](../../raw/master/Processing/HelloWorld). The example works with with Processing 3.3.7 (Java).
+[Source code](Processing/HelloWorld/HelloWorld.pde#L1) for a very simple example can be downloaded from [here](../../raw/master/Processing/HelloWorld/HelloWorld.pde). The example works with with Processing 3.3.7 (Java).