Update Travis to Bionic and Python 3.6 (#947)

* Update Travis to Python 3.6

* Let's try bionic

* It's just python3 on bionic

* apt update

* Maybe this

* Use generic build image

* >defaults to Ruby

.travis.yml

@@ -1,9 +1,6 @@
-language: csharp
-
-dist: trusty
+language: generic
+dist: bionic
 sudo: false
-mono: none
-# dotnet: 3.1.100 # Travis is shitting itself right now and it can't locate .NET Core packages.
 
 os:
 - linux
@@ -11,11 +8,9 @@ os:
 
 addons:
   apt:
-    #sources:
-    #- deadsnakes
-
+    update: true
     packages:
-    - python3.5
+    - python3
     - python3-pip
 
 cache:
@@ -31,12 +26,8 @@ install:
 #  - if [ $TRAVIS_OS_NAME = osx ]; then brew update && brew upgrade python; fi
 
 before_script:
-#- "pyenv versions"
-#- "if [ $TRAVIS_OS_NAME = linux ]; then pyenv shell 3.6; fi"
-#- "python3.6 -m pip --v"
-#- "python3.6 -m pip install --user --upgrade requests"
-- "python3.5 -m pip install --user requests"
-- "python3.5 RUN_THIS.py --no-prompt"
+- "python3.6 -m pip install --user requests"
+- "python3.6 RUN_THIS.py --no-prompt"
 
 script:
 - "Tools/run_travis.sh"

Tools/run_travis.sh

@@ -6,5 +6,5 @@ set -e
 # Travis is shitting itself. Wonderful.
 PATH="~/.dotnet:$PATH"
 
-dotnet build RobustToolbox.sln /p:Python=python3.5
+dotnet build RobustToolbox.sln /p:Python=python3.6
 dotnet test Robust.UnitTesting/Robust.UnitTesting.csproj