change the type of Connection ID to byte slice

internal/protocol/connection_id_test.go

@@ -14,4 +14,13 @@ var _ = Describe("Connection ID generation", func() {
 		Expect(err).ToNot(HaveOccurred())
 		Expect(c1).ToNot(Equal(c2))
 	})
+
+	It("says if connection IDs are equal", func() {
+		c1 := ConnectionID{1, 2, 3, 4, 5, 6, 7, 8}
+		c2 := ConnectionID{8, 7, 6, 5, 4, 3, 2, 1}
+		Expect(c1.Equal(c1)).To(BeTrue())
+		Expect(c2.Equal(c2)).To(BeTrue())
+		Expect(c1.Equal(c2)).To(BeFalse())
+		Expect(c2.Equal(c1)).To(BeFalse())
+	})
 })