Add go report card badge

README.md

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 # DNAQuery
 
+[![Go Report Card](https://goreportcard.com/badge/github.com/lifechurch/dnaquery)](https://goreportcard.com/report/github.com/lifechurch/dnaquery)
+
 DNAQuery is a command line utility to take [LogDNA](https://logdna.com) archives and load them into [BigQuery](https://cloud.google.com/bigquery/). This allows long-term, queryable storage of logs in BigQuery (which is considerably more cost effective). In our use case we want real-time access to lots of different logs, and long-term storage of a subset of those logs. This approach has helped us find a balance between access and cost.
 
 ## Getting Started