RFC8813 is not referrable from the CLI as a valid lint source (#879)

Author: christopher-henderson

v3/lint/source.go

@@ -53,7 +53,7 @@ func (s *LintSource) UnmarshalJSON(data []byte) error {
 	}
 
 	switch LintSource(throwAway) {
-	case RFC5280, RFC5480, RFC5891, CABFBaselineRequirements, CABFEVGuidelines, CABFSMIMEBaselineRequirements, MozillaRootStorePolicy, AppleRootStorePolicy, Community, EtsiEsi, RFC6962:
+	case RFC8813, RFC5280, RFC5480, RFC5891, CABFBaselineRequirements, CABFEVGuidelines, CABFSMIMEBaselineRequirements, MozillaRootStorePolicy, AppleRootStorePolicy, Community, EtsiEsi, RFC6962:
 		*s = LintSource(throwAway)
 		return nil
 	default:
@@ -77,6 +77,8 @@ func (s *LintSource) FromString(src string) {
 		*s = RFC5480
 	case RFC5891:
 		*s = RFC5891
+	case RFC8813:
+		*s = RFC8813
 	case CABFBaselineRequirements:
 		*s = CABFBaselineRequirements
 	case CABFEVGuidelines: