Update travis

.travis.yml

@@ -1,21 +1,12 @@
-sudo: required
-dist: bionic
-language: python
+import:
+  - source: QubesOS/qubes-continuous-integration:R4.1/travis-base-r4.1.yml
+    mode: deep_merge_prepend
+  - source: QubesOS/qubes-continuous-integration:R4.1/travis-dom0-r4.1.yml
+  - source: QubesOS/qubes-continuous-integration:R4.1/travis-vms-r4.1.yml
 python: '3.7'
 services:
   - xvfb
   - docker
-install:
- - git clone https://github.com/QubesOS/qubes-builder ~/qubes-builder
-script: ~/qubes-builder/scripts/travis-build
-env:
- - DIST_DOM0=fc31 USE_QUBES_REPO_VERSION=4.1 USE_QUBES_REPO_TESTING=1
- - DISTS_VM=fc29 USE_QUBES_REPO_VERSION=4.1 USE_QUBES_REPO_TESTING=1
- - DISTS_VM=fc30 USE_QUBES_REPO_VERSION=4.1 USE_QUBES_REPO_TESTING=1
- - DISTS_VM=stretch USE_QUBES_REPO_VERSION=4.1 USE_QUBES_REPO_TESTING=1
- - DISTS_VM=buster USE_QUBES_REPO_VERSION=4.1 USE_QUBES_REPO_TESTING=1
- - DISTS_VM=centos7 USE_QUBES_REPO_VERSION=4.1 USE_QUBES_REPO_TESTING=1
-
 jobs:
   include:
     - name: pylint
@@ -43,12 +34,5 @@ jobs:
     - stage: deploy
       python: '3.6'
       script: ~/qubes-builder/scripts/travis-deploy
-
 after_success:
-  - codecov
-
-# don't build tags which are meant for code signing only
-branches:
-  except:
-    - /.*_.*/
-    - build
+  - codecov