Update travis config

Author: Stuart Bishop

.travis.yml

@@ -5,7 +5,7 @@ before_install:
   - sudo locale-gen
   - sudo add-apt-repository -y ppa:deadsnakes/ppa
   - sudo apt-get update -y -qq
-  - sudo apt-get install -y python-all python-all-dev python3-all python3-all-dev build-essential python-setuptools python3-setuptools python-wheel python3-wheel python3-docutils python3-sphinx python3-flake8 python-flake8 python2.4-complete python2.5-complete python2.6-complete python3.1-complete python3.2-complete python3.3-complete python3.5-complete python2.4-gdbm python2.4-gdbm-dbg python3.6 wget python-pip python3-pip python3.7 python3.7-dev python3.7-distutils
+  - sudo apt-get install -y python-all python-all-dev python3-all python3-all-dev build-essential python-setuptools python3-setuptools python-wheel python3-wheel python3-docutils python3-sphinx python3-flake8 python-flake8 python2.4-complete python2.5-complete python2.6-complete python3.1-complete python3.2-complete python3.3-complete python3.5-complete python2.4-gdbm python2.4-gdbm-dbg python3.6 wget python-pip python3-pip python3.7 python3.7-dev python3.7-distutils python3.8 python3.8-dev python3.8-distutils python3.9 python3.9-dev python3.9-distutils
   - sudo pip install wheel
   - sudo pip3 install wheel