Update CI config

Author: mikicz

.circleci/config.yml

@@ -0,0 +1,17 @@
+version: 2
+jobs:
+  build:
+    docker:
+      - image: themattrix/tox
+        environment: # environment variables for primary container
+          DATABASE_URL: postgresql://root@localhost/circle_test?sslmode=disable
+          DB_USER: root
+          DB_NAME: circle_test
+      - image: circleci/postgres:9.6.2 # an example of how to specify a service container
+        environment:
+          POSTGRES_USER: root
+          POSTGRES_DB: circle_test
+    steps:
+      - checkout
+      - run: apt-get update && apt-get install -y libpq-dev
+      - run: tox

README.md

@@ -1,7 +1,6 @@
 # SQL Views for Postgres
 
-[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/mypebble/django-pgviews?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
-[![Circle CI](https://circleci.com/gh/mypebble/django-pgviews.png)](https://circleci.com/gh/mypebble/django-pgviews)
+[![Circle CI](https://circleci.com/gh/mikicz/django-pgviews.png)](https://circleci.com/gh/mikicz/django-pgviews)
 
 Adds first-class support for [PostgreSQL Views][pg-views] in the Django ORM