re-add support for version 30

fixes #72

protocol/version.go

@@ -11,7 +11,7 @@ type VersionNumber int
 
 // SupportedVersions lists the versions that the server supports
 var SupportedVersions = []VersionNumber{
-	31, 32,
+	30, 31, 32,
 }
 
 // SupportedVersionsAsTags is needed for the SHLO crypto message

protocol/version_test.go

@@ -19,7 +19,7 @@ var _ = Describe("Version", func() {
 	})
 
 	It("has proper tag list", func() {
-		Expect(protocol.SupportedVersionsAsTags).To(Equal([]byte("Q031Q032")))
+		Expect(protocol.SupportedVersionsAsTags).To(Equal([]byte("Q030Q031Q032")))
 	})
 
 	It("recognizes supported versions", func() {