requirements.txt: bump cryptography Py package version

nvlsianpu · nvlsianpu · commit 9686e702e4b9 · 2019-06-18T14:08:27.000+02:00
Since Ed25519 curve primitives are available since cryptography package
version 2.6 need to bump its version.

Signed-off-by: Andrzej Puzdrowski &lt;andrzej.puzdrowski@nordicsemi.no&gt;
diff --git a/scripts/requirements.txt b/scripts/requirements.txt
@@ -1,3 +1,3 @@
-cryptography
+cryptography>=2.6
 intelhex
 click
