Change Nextflow command version to V3

Updated Nextflow command to use version V3.

Author: afiyachida

README.md

@@ -66,7 +66,7 @@ To run this pipeline, you need nextflow and conda or singularity installed on yo
 A set of test data are available in this repo to allow you to test the pipeline with just one command line:
 
 ```
-nextflow run bcgsc/Canadian_Biogenome_Project -latest -r V2 -profile conda
+nextflow run bcgsc/Canadian_Biogenome_Project -latest -r V3 -profile conda
 ```
 
 The outputs are organized in several subfolder that are self-explenatory.