Update badge to 1.0.0 (#1333)

Signed-off-by: Anders Eknert <anders@styra.com>

README.md

@@ -1,7 +1,7 @@
 # Regal
 
 [![Build Status](https://github.com/styrainc/regal/workflows/Build/badge.svg?branch=main)](https://github.com/styrainc/regal/actions)
-![OPA v0.70.0](https://openpolicyagent.org/badge/v0.70.0)
+![OPA v1.0.0](https://openpolicyagent.org/badge/v1.0.0)
 [![codecov](https://codecov.io/github/StyraInc/regal/graph/badge.svg?token=EQK01YF3X3)](https://codecov.io/github/StyraInc/regal)
 [![Downloads](https://img.shields.io/github/downloads/styrainc/regal/total.svg)](https://github.com/StyraInc/regal/releases)