Add CircleCI integration

Author: lyndsysimon

.circleci/config.yml

@@ -0,0 +1,35 @@
+version: 2
+jobs:
+  build:
+    docker:
+      - image: circleci/python:3.6.4
+
+    working_directory: ~/repo
+
+    steps:
+      - checkout
+
+      - restore_cache:
+          keys:
+            - tox-{{ checksum "Pipfile.lock" }}
+
+      - run:
+          name: Set permissions
+          command: |
+            sudo chown -R circleci:circleci /usr/local/bin
+            sudo chown -R circleci:circleci /usr/local/lib/python3.6/site-packages
+
+      - run:
+          name: Install tox
+          command: |
+            pip install tox
+
+      - run:
+          name: Run tests
+          command: |
+            tox
+
+      - save_cache:
+          key: tox-{{ checksum "Pipfile.lock" }}
+          paths:
+            - ".tox"

README.md

@@ -1,7 +1,12 @@
 # Universal Analytics for Python
 
+
 This library provides a Python interface to Google Analytics, supporting the Universal Analytics Measurement Protocol, with an interface modeled (loosely) after Google's `analytics.js`.
 
+# Status
+
+| CircleCI | [![CircleCI](https://circleci.com/gh/lyndsysimon/universal-analytics-python.svg?style=svg)](https://circleci.com/gh/lyndsysimon/universal-analytics-python) |
+
 # Usage
 
 A simple example: