update circleci stuff for version 2.0

Author: jeremylow

.circleci/config.yml

@@ -0,0 +1,20 @@
+version: 2
+jobs:
+    build:
+        working_directory: ~/repo
+        docker:
+            - image: jeremylow/python-twitter
+        steps:
+            - checkout
+            - run: sudo chown -R circleci:circleci ~/repo
+            - run:
+                name: set up pyenv
+                command: pyenv local 2.7.15 3.7.1 pypy-5.7.1 pypy3.5-6.0.0
+            - run:
+                name: install deps
+                command: pip install -r requirements.testing.txt
+            - run:
+                name: run tests
+                command: |
+                    export PATH=/home/circleci/.local/bin:$PATH
+                    make tox

.circleci/images/Dockerfile

@@ -0,0 +1,21 @@
+# We could use a smaller image, but this ensures that everything CircleCI needs
+# is installed already.
+FROM circleci/python:3.6
+MAINTAINER Jeremy Low <[email protected]>
+
+# These are the version of python currently supported.
+ENV SUPPORTED_VERSIONS="2.7.15 3.7.1 pypy-5.7.1 pypy3.5-6.0.0"
+ENV PYENV_ROOT /home/circleci/.pyenv
+ENV PATH $PYENV_ROOT/shims:$PYENV_ROOT/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:$PATH
+
+# Get and install pyenv.
+RUN curl -L https://github.com/pyenv/pyenv-installer/raw/master/bin/pyenv-installer | bash
+
+# pyenv installer doesn't set these for us.
+RUN echo "export PATH=${PYENV_ROOT}/bin:$$PATH \n\
+eval '\$(pyenv init -)' \n\
+eval '\$(pyenv virtualenv-init -)'" >> ~/.bashrc
+RUN pyenv update
+
+# Install each supported version into the container.
+RUN for i in $SUPPORTED_VERSIONS; do pyenv install "$i"; done

circle.yml

@@ -1,5 +1,5 @@
 [tox]
-envlist = clean,py27,py36,pypy,pypy3,codestyle,coverage
+envlist = clean,py27,py37,pypy,pypy3,codestyle,coverage
 skip_missing_interpreters = True
 
 [testenv]