Add nightly test build (#5)

Author: CelestineKao

.circleci/config.yml

@@ -40,6 +40,14 @@ jobs:
       - run: pip install flit
       - run: flit build
       - run: flit publish
+  test-nightly:
+    docker:
+      - image: circleci/python:3.6
+    steps:
+      - checkout
+      - install-deps
+      - run: tox
+      - run: flit build
 
 workflows:
   pull_request:
@@ -59,3 +67,14 @@ workflows:
               only: /v[0-9]+(\.[0-9]+)*/
             branches:
               ignore: /.*/
+  nightly:
+    triggers:
+      - schedule:
+          cron: "0 0 * * *"
+          filters:
+            branches:
+              only:
+                - master
+    jobs:
+      - test-nightly:
+          context: opensource

README.md

@@ -1,6 +1,6 @@
 # async-task-queue
 
-[![CircleCI](https://circleci.com/gh/NarrativeScience/async-task-queue/tree/master.svg?style=shield)](https://circleci.com/gh/NarrativeScience/async-task-queue/tree/master)[![](https://img.shields.io/pypi/v/async-task-queue.svg)](https://pypi.org/pypi/async-task-queue/) [![License](https://img.shields.io/badge/License-BSD%203--Clause-blue.svg)](https://opensource.org/licenses/BSD-3-Clause)
+[![CircleCI](https://circleci.com/gh/NarrativeScience/async-task-queue/tree/master.svg?style=shield)](https://circleci.com/gh/NarrativeScience/async-task-queue/tree/master) [![](https://img.shields.io/pypi/v/async-task-queue.svg)](https://pypi.org/pypi/async-task-queue/) [![License](https://img.shields.io/badge/License-BSD%203--Clause-blue.svg)](https://opensource.org/licenses/BSD-3-Clause)
 
 In-memory FIFO queue for concurrent task execution. Used to execute tasks concurrently with optional control (via semaphore) over the max number of tasks running at the same time.