fix(v2): allow semver to start with a 'v'

build/semver

@@ -2,7 +2,7 @@
 
 set -o errexit -o nounset -o pipefail
 
-SEMVER_REGEX="^(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)(\\-[0-9A-Za-z-]+(\\.[0-9A-Za-z-]+)*)?(\\+[0-9A-Za-z-]+(\\.[0-9A-Za-z-]+)*)?$"
+SEMVER_REGEX="^v(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)(\\-[0-9A-Za-z-]+(\\.[0-9A-Za-z-]+)*)?(\\+[0-9A-Za-z-]+(\\.[0-9A-Za-z-]+)*)?$"
 
 PROG=semver
 PROG_VERSION=2.1.0
@@ -76,7 +76,7 @@ function validate-version {
       echo "$version"
     fi
   else
-    error "version $version does not match the semver scheme 'X.Y.Z(-PRERELEASE)(+BUILD)'. See help for more information."
+    error "version $version does not match the semver scheme 'vX.Y.Z(-PRERELEASE)(+BUILD)'. See help for more information."
   fi
 }