Force update dependencies when installing tox on AppVeyor.

See tox-dev/tox#1302 (comment)

Author: fschulze

.appveyor.yml

@@ -14,7 +14,7 @@ install:
 #  - pypy --version
   - echo Installed Pythons
   - dir c:\Python*
-  - C:\Python35\python -m pip install tox
+  - C:\Python35\python -m pip install tox -U --force-reinstall
 
 build: false
 

.travis.yml

@@ -1,135 +0,0 @@
-dist: xenial
-language: python
-sudo: false
-python:
-  - "2.7"
-  - "3.4"
-  - "3.7"
-  - "nightly"
-  - "pypy2.7-6.0"
-  - "pypy3.5-6.0"
-env:
-  global:
-    - DEVPI_INDEX="devpi-travis/${TRAVIS_REPO_SLUG/\//_}_${TRAVIS_BRANCH/\//_}"
-  matrix:
-    - PROJECT=common
-    - PROJECT=web
-    - PROJECT=client
-install: travis_retry pip install tox-travis devpi-client
-script:
-  - export DEVPI_INDEX_URL="https://pypi.org/simple/"
-  - test "${DEVPI_TRAVIS_PASSWD}" != "" && export DEVPI_INDEX_URL="https://m.devpi.net/${DEVPI_INDEX}" || true
-  - echo "${DEVPI_INDEX_URL}"
-  - cd $PROJECT
-  - travis_retry tox -i "${DEVPI_INDEX_URL}" --pre
-stages:
-  - name: create packages
-    if: type IN (push, api, cron)
-  - test
-jobs:
-  include:
-    - stage: create packages
-      addons: []
-      install: travis_retry pip install devpi-client "towncrier<18.6.0"
-      python: "2.7"
-      env: []
-      script:
-        - devpi use https://m.devpi.net/devpi-travis
-        - devpi login devpi-travis --password ${DEVPI_TRAVIS_PASSWD}
-        - yes yes | devpi index --delete "${DEVPI_INDEX}" || true
-        - devpi index -c "${DEVPI_INDEX}" bases=root/pypi
-        - devpi use "${DEVPI_INDEX}"
-        - devpi push --index root/pypi devpi-server==4.0.0 "${DEVPI_INDEX}"
-        - devpi push --index root/pypi devpi-server==4.2.1 "${DEVPI_INDEX}"
-        - cd ${TRAVIS_BUILD_DIR}/common
-        - yes | towncrier
-        - devpi upload
-        - cd ${TRAVIS_BUILD_DIR}/server
-        - yes | towncrier
-        - devpi upload
-        - cd ${TRAVIS_BUILD_DIR}/web
-        - yes | towncrier
-        - devpi upload
-        - cd ${TRAVIS_BUILD_DIR}/client
-        - yes | towncrier
-        - devpi upload
-        - cd ${TRAVIS_BUILD_DIR}/postgresql
-        - yes | towncrier
-        - devpi upload
-
-    #########################
-    #
-    # server
-    #
-    #########################
-    - stage: test
-      python: "2.7"
-      env: PROJECT=server
-      addons:
-        apt:
-          packages:
-            - nginx
-
-    - stage: test
-      python: "3.4"
-      env: PROJECT=server
-      addons:
-        apt:
-          packages:
-            - nginx
-
-    - stage: test
-      python: "3.7"
-      env: PROJECT=server
-      addons:
-        apt:
-          packages:
-            - nginx
-
-    - stage: test
-      python: "nightly"
-      env: PROJECT=server
-      addons:
-        apt:
-          packages:
-            - nginx
-
-    - stage: test
-      python: "pypy2.7-6.0"
-      env: PROJECT=server
-      addons:
-        apt:
-          packages:
-            - nginx
-
-    - stage: test
-      python: "pypy3.5-6.0"
-      env: PROJECT=server
-      addons:
-        apt:
-          packages:
-            - nginx
-
-    #########################
-    #
-    # postgresql
-    #
-    #########################
-
-    - stage: test
-      python: "3.4"
-      env: PROJECT=postgresql
-      addons:
-        apt:
-          packages:
-            - nginx
-        postgresql: "9.5"
-
-    - stage: test
-      python: "pypy3.5-6.0"
-      env: PROJECT=postgresql
-      addons:
-        apt:
-          packages:
-            - nginx
-        postgresql: "9.5"