TST: disable travis build py 3.5 with requirements

Author: Sebastian Wagner

.travis.yml

@@ -15,6 +15,9 @@ matrix:
     env: mode=debian
   - python: 3.8
     env: mode=codestyle
+  exclude:
+  - python: 3.5
+    env: requirements=true
 before_install:
   - if [[ -v requirements ]]; then curl -s -O https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.6.1-amd64.deb; fi
   - if [[ -v requirements ]]; then sudo dpkg -i --force-confnew elasticsearch-7.6.1-amd64.deb; fi

CHANGELOG.md

@@ -33,6 +33,7 @@ CHANGELOG
 ### Packaging
 
 ### Tests
+- Travis: Deactivate tests with optional requirements on Python 3.5, as the build fails because of abusix/querycontacts version conflicts on dnspython.
 
 ### Tools