requirements.txt: Switch to osmocom fork of asn1tools

This is sadly required as the Interoperable Profile format must process
elements of an ASN.1 sequence in order, which doesn't work if the parser
puts the elements in a python dict.

The osmocom fork of asn1tools hence uses OrderedDict to work around
this problem.

Change-Id: Id28fcf060f491bb3d76aa6d8026aa76058edb675
---
M requirements.txt
1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/requirements.txt b/requirements.txt
index 5b735f0..c12daf8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,6 +11,6 @@
 colorlog
 pycryptodomex
 cryptography
-asn1tools
+git+https://github.com/osmocom/asn1tools
 packaging
 git+https://github.com/hologram-io/smpp.pdu

