Added godoc badge

Author: murphybytes

README.md

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 # Analyze
 
+[![Documentation](https://godoc.org/github.com/murphybytes/analyze?status.svg)](http://godoc.org/github.com/murphybytes/analyze)
+
 A predicate expression evaluator designed to embed logical expressions in YAML or JSON. Think of being able to 
 apply a SQL where clause on a set of data that you supply.  For example, let say we have an array of objects.
 ```json