tox and travis are not used anymore

.travis.yml

@@ -1,26 +0,0 @@
-dist: xenial
-sudo: false
-language: python
-
-python:
-  - "3.5"
-  - "3.6"
-  - "3.7"
-  - "3.8"
-  - "3.9"
-  - "nightly"
-matrix:
-  allow_failures:
-    - python: "nightly"
-  include:
-    - python: "3.7"
-      env: TOXENV=py37
-      dist: xenial
-      sudo: true
-
-install:
-  - pip install coveralls tox-travis
-script:
-  - tox
-after_success:
-  - coveralls

MANIFEST.in

@@ -3,7 +3,6 @@ include *.txt
 include license.txt
 include samples/passwd
 include tests/plugins/passwd
-include tox.ini
 
 recursive-include docs *.css
 recursive-include docs *.html

tox.ini

@@ -1,33 +0,0 @@
-[flake8]
-ignore =
-    E265,  # block comment should start with '# ' (~64 warnings)
-    E501,  # line too long  (~664 warnings)
-
-[tox]
-envlist =
-    py36,
-    py37,
-    py38,
-    py39,
-    coverage,
-    flake8,
-    check-manifest
-
-[testenv]
-deps = nose
-commands = nosetests
-
-[testenv:flake8]
-deps = flake8
-commands = flake8
-
-[testenv:coverage]
-commands =
-    python -m coverage erase
-    python -m coverage run --branch --source=hbmqtt -m unittest
-    python -m coverage report
-deps = coverage
-
-[testenv:check-manifest]
-deps = check-manifest
-commands = check-manifest