Merge pull request #4 from codacy-badger/codacy-badge

Add a Codacy badge to README.md

README.md

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 # Datadog logback appender
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+[![Codacy Badge](https://api.codacy.com/project/badge/Grade/aeaa427beba846c79c582c2a51765f15)](https://app.codacy.com/app/gjsduarte/logback-datadog-appender?utm_source=github.com&utm_medium=referral&utm_content=gjsduarte/logback-datadog-appender&utm_campaign=Badge_Grade_Dashboard)
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 This appender sends logs to your [Datadog](https://www.datadoghq.com/) account, in bulks using non-blocking threading. Please note that this appender requires logback version 1.2.3 and up, and java 8 and up.
 
 ### Technical Information