Fix broken travis config

.gitignore

@@ -21,9 +21,10 @@ restic_data/
 restic_cache/
 alerts.env
 
-# docs
+# build
 build/
 docs/_build
+dist
 
 # tests
 .tox

.travis.yml

@@ -9,7 +9,7 @@ matrix:
       sudo: true
 
 install: 
-  - pip install -U setuptools
+  - pip install -U setuptools pip wheel
   - pip install -r src/tests/requirements.txt
   - pip install src