Update README.rst

SPI is sensitive to electromagnetic noise
miguelbalboa · Jan 26, 2017 · fe0e15e · fe0e15e
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@@ -196,6 +196,8 @@ Troubleshooting
   #. Check your connection, see `Pin Layout`_ .
   #. Check voltage. Most breakouts work with 3.3V.
   #. SPI only works with 3.3V, most breakouts seem 5V tollerant, but try a level shifter.
+  #. SPI do not like long connections. Try shorter connections.
+  #. SPI do not like prototyping boards. Maybe try a soldered connections.
   #. According to reports #101, #126 and #131, there may be a problem with the soldering on the MFRC522 breakout. You could fix this on your own.