language: python
python:
  - "3.7"
install:
  - pip install -r requirements.txt
script:
  - docker login -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD"
  - docker build ./base -t feedthebeast/base
  - python build.py
sudo: required
services:
  - docker
dist: trusty

language: python
python:
  - "3.6"
install:
  - pip install -r requirements.txt
script:
  - docker login -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD"
  - docker build ./base -t feedthebeast/base
  - python build.py
sudo: required
services:
  - docker
dist: trusty

Change from python 3.7 to 3.6
Change from python 3.7 to 3.6
