fix badges

Signed-off-by: Terence Parr <parrt@antlr.org>

README.md

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 **ANTLR** (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files. It's widely used to build languages, tools, and frameworks. From a grammar, ANTLR generates a parser that can build parse trees and also generates a listener interface (or visitor) that makes it easy to respond to the recognition of phrases of interest.
 
-**Build status**
+**Dev branch build status**
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