Use h2 tags in the README rather than multiple h1 tags
Use h2 tags in the README rather than multiple h1 tags

holdenk/spark-testing-base,snithish/spark-testing-base,holdenk/spark-testing-base,snithish/spark-testing-base,holdenk/spark-testing-base,snithish/spark-testing-base,holdenk/spark-testing-base,snithish/spark-testing-base