integrate with airflow-config

[timkpaine]

fixes #10

[github-actions]

Test Results

17 tests  +2   16 ✅ +2   7s ⏱️ -1s
 1 suites ±0    1 💤 ±0 
 1 files   ±0    0 ❌ ±0 

Results for commit deb598c. ± Comparison against base commit b4fd71c.

[codecov]

Codecov Report

Attention: Patch coverage is 89.70588% with 7 lines in your changes missing coverage. Please review.

Files	Patch %	Lines
airflow_priority/common.py	76.92%	2 Missing and 1 partial ⚠️
airflow_priority/plugins/datadog.py	66.66%	1 Missing ⚠️
airflow_priority/plugins/discord.py	75.00%	1 Missing ⚠️
airflow_priority/plugins/newrelic.py	66.66%	1 Missing ⚠️
airflow_priority/plugins/slack.py	75.00%	1 Missing ⚠️

Files	Coverage Δ
airflow_priority/plugins/symphony.py	54.90% <100.00%> (ø)
airflow_priority/tests/conftest.py	100.00% <100.00%> (ø)
airflow_priority/tests/test_airflow_config.py	100.00% <100.00%> (ø)
airflow_priority/tests/test_datadog.py	100.00% <100.00%> (ø)
airflow_priority/tests/test_discord.py	100.00% <100.00%> (ø)
airflow_priority/tests/test_newrelic.py	100.00% <100.00%> (ø)
airflow_priority/tests/test_slack.py	100.00% <100.00%> (ø)
airflow_priority/tests/test_symphony.py	83.33% <100.00%> (ø)
airflow_priority/plugins/datadog.py	89.58% <66.66%> (ø)
airflow_priority/plugins/discord.py	93.61% <75.00%> (+0.13%)	⬆️
... and 3 more