Removed dotenv, updated README, and general cleanup. Closes #3 #4
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Removed dotenv and cleaned up unused dependencies.
Updated SparkPost and test libs to latest.
Updated the README to follow more standard transport doc format.
Also, I removed the mention of tags from the docs because they didn't do anything. There is no tags property on the transmission body. Should probably clean up that bit of code because it wouldn't have done anything anyway.