FIX travis: Unable to install module "l10n_it_fatturapa" because an e…

…xternal dependency is not met: No module named asn1crypto (#1497)

.travis.yml

@@ -30,6 +30,7 @@ install:
   - pip install codicefiscale
   - pip install unidecode==0.04.17
   - pip install PyXB==1.2.6
+  - pip install asn1crypto==0.24.0
 
 script:
   - travis_run_tests