Update README.md

Author: tomashhurst

README.md

@@ -6,6 +6,7 @@ A computational toolkit in R for the integration, exploration, and analysis of h
 
 **Current version**: [`v1.2.0`](https://github.com/ImmuneDynamics/Spectre/releases)
 
+[![R-CMD-check](https://github.com/ImmuneDynamics/Spectre/actions/workflows/check-standard.yaml/badge.svg)](https://github.com/ImmuneDynamics/Spectre/actions/workflows/check-standard.yaml)
 [![R-CMD-check](https://github.com/ImmuneDynamics/Spectre/actions/workflows/check-standard.yaml/badge.svg)](https://github.com/ImmuneDynamics/Spectre/actions/workflows/check-standard.yaml)
 [![AppVeyor build status](https://ci.appveyor.com/api/projects/status/akhvb8wub6d6xhtd?svg=true)](https://ci.appveyor.com/project/tomashhurst/spectre)