make sure they get a recent version of busdevice with i2c write-then-read support

ladyada · ladyada · commit 92fe6672a6a5 · 2018-08-17T23:42:54.000-04:00
diff --git a/requirements.txt b/requirements.txt
@@ -1,2 +1,2 @@
 Adafruit-Blinka
-adafruit-circuitpython-busdevice
+adafruit-circuitpython-busdevice>=2.2.5

Original file line number	Diff line number	Diff line change
`@@ -1,2 +1,2 @@`
`1`	`1`	`Adafruit-Blinka`
`2`		`-adafruit-circuitpython-busdevice`
	`2`	`+adafruit-circuitpython-busdevice>=2.2.5`