fix tox

Author: bdraco

setup.py

@@ -38,7 +38,7 @@ def _cryptography_version():
     'pycrypto': ['pycrypto >=2.6.0, <2.7.0'] + pyasn1,
     'pycryptodome': ['pycryptodome >=3.3.1, <4.0.0'] + pyasn1,
 }
-legacy_backend_requires = ['ecdsa <1.0', 'rsa'] + pyasn1
+legacy_backend_requires = ['ecdsa <0.15', 'rsa'] + pyasn1
 install_requires = ['six <2.0']
 
 # TODO: work this into the extras selection instead.

tox.ini

@@ -21,6 +21,8 @@ deps =
     pytest
     pytest-cov
     pytest-runner
+    -r{toxinidir}/requirements.txt
+
 commands_pre =
     # Remove the python-rsa and python-ecdsa backends
     only: pip uninstall -y ecdsa rsa