Merge pull request #84 from SiboVG/issue-83

[#83] Update link to datasheet

README.md

@@ -24,7 +24,7 @@ Because the TMC2209 uses one shared pin for transmit and receive in the UART com
 Well, the Pi receives 4 bytes from itself and 8 bytes from the driver. So the Pi receives a total of 12 bytes and only the last 8 are the reply, of which only 4 are data bytes.
 
 The Documentation of the TMC2209 can be found here:
-[TMC2209 - Datsheet](https://www.trinamic.com/fileadmin/assets/Products/ICs_Documents/TMC2209_Datasheet_rev1.06.pdf)
+[TMC2209 - Datsheet](https://www.analog.com/media/en/technical-documentation/data-sheets/TMC2209_datasheet_rev1.09.pdf)
 
 The code is also available on [PyPI](https://pypi.org/project/TMC-2209-Raspberry-Pi).