travis updated

Author: tawabshakeel

.travis.yml

@@ -1,26 +1,22 @@
 language: python            # this works for Linux but is an error on macOS or Windows
 python:
-  - "2.7"
-  - "3.4"
-  - "3.5"
   - "3.6"      # current default Python on Travis CI
   - "3.7"
-  - "3.8"
 jobs:
   include:
-    - name: "Python 3.8.0 on Xenial Linux"
+    - name: "Python 3.6.0 on Xenial Linux"
       python: 3.8           # this works for Linux but is ignored on macOS or Windows
-    - name: "Python 3.7.4 on macOS"
+    - name: "Python 3.6.0 on macOS"
       os: osx
       osx_image: xcode11.2  # Python 3.7.4 running on macOS 10.14.4
       language: shell       # 'language: python' is an error on Travis CI macOS
-    - name: "Python 3.8.0 on Windows"
+    - name: "Python 3.6.0 on Windows"
       os: windows           # Windows 10.0.17134 N/A Build 17134
       language: shell       # 'language: python' is an error on Travis CI Windows
       before_install:
-        - choco install python --version 3.8.0
+        - choco install python --version 3.6.0
         - python -m pip install --upgrade pip
-      env: PATH=/c/Python38:/c/Python38/Scripts:$PATH
+      env: PATH=/c/Python36:/c/Python36/Scripts:$PATH
 install:
   - pip3 install --upgrade pip  # all three OSes agree about 'pip3'
   - pip install -r requirements.txt