Adding DSA key check to regex list

main.go

@@ -51,6 +51,7 @@ func init() {
 	regexes = map[string]*regexp.Regexp{
 		"PKCS8":    regexp.MustCompile("-----BEGIN PRIVATE KEY-----"),
 		"RSA":      regexp.MustCompile("-----BEGIN RSA PRIVATE KEY-----"),
+                "DSA":      regexp.MustCompile("-----BEGIN DSA PRIVATE KEY-----"),
 		"SSH":      regexp.MustCompile("-----BEGIN OPENSSH PRIVATE KEY-----"),
 		"Facebook": regexp.MustCompile("(?i)facebook.*['\"][0-9a-f]{32}['\"]"),
 		"Twitter":  regexp.MustCompile("(?i)twitter.*['\"][0-9a-zA-Z]{35,44}['\"]"),