Jump to python 3.7 as it is the default buster version

.travis.yml

@@ -8,13 +8,13 @@ addons:
 
 matrix:
   include:
-    - python: 3.5
-      env: TOXENV=py35
-    - python: 3.5
+    - python: 3.7
+      env: TOXENV=py37
+    - python: 3.7
       env: TOXENV=lint
-    - python: 3.6
+    - python: 3.7
       env: TOXENV=format-check
-    - python: 3.5
+    - python: 3.7
       env: TOXENV=docs
 
 install:

setup.py

@@ -27,7 +27,7 @@ setup(name='Moulinette',
       license='AGPL',
       packages=find_packages(exclude=['test']),
       data_files=[(LOCALES_DIR, locale_files)],
-      python_requires='>=3.5',
+      python_requires='>=3.7',
       install_requires=[
           'argcomplete',
           'psutil',

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 envlist = 
-  py35
+  py37
   lint
   docs
 skipdist = True
@@ -44,6 +44,7 @@ skip_install = {[testenv:format]skip_install}
 usedevelop = {[testenv:format]usedevelop}
 
 [testenv:docs]
+basepython = python3.7
 usedevelop = True
 commands = python -m sphinx -W doc/ doc/_build
 deps =