Add missing "-v" option in test command in README.md
Add missing "-v" option in test command in README.md

In "## Testing" section of README.md, there is a missing "-v" which maybe lead to confusion:

go test `go list ./... | grep -v consul` | grep -v 'no test files'

AsynkronIT/gam,AsynkronIT/protoactor-go,AsynkronIT/gam,AsynkronIT/protoactor-go,rogeralsing/gam