update etreeutils.TransformExcC14n signature (#478)

* update etreeutils.TransformExcC14n signature

The invocation does not match the current function signature:

```
github.com/crewjam/saml@v0.4.10/schema.go:767:41: not enough arguments in call to etreeutils.TransformExcC14n
     |  have (*etree.Element, string)
     |  want (*etree.Element, string, bool)
```

* Update go.mod

* upgrade to github.com/russellhaering/goxmldsig v1.2.0

* update go.sum

* update github.com/russellhaering/goxmldsig

* upgrade to github.com/russellhaering/goxmldsig v1.2.0

go.mod

@@ -12,7 +12,8 @@ require (
 	github.com/kr/pretty v0.3.0
 	github.com/mattermost/xml-roundtrip-validator v0.1.0
 	github.com/pkg/errors v0.9.1 // indirect
-	github.com/russellhaering/goxmldsig v1.1.1
+	github.com/russellhaering/goxmldsig v1.2.0
+	github.com/stretchr/testify v1.6.1
 	github.com/zenazn/goji v1.0.1
 	golang.org/x/crypto v0.0.0-20220128200615-198e4374d7ed
 	gotest.tools v2.2.0+incompatible

go.sum

@@ -33,8 +33,8 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
 github.com/rogpeppe/go-internal v1.6.1/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
 github.com/rogpeppe/go-internal v1.8.0 h1:FCbCCtXNOY3UtUuHUYaghJg4y7Fd14rXifAYUAtL9R8=
 github.com/rogpeppe/go-internal v1.8.0/go.mod h1:WmiCO8CzOY8rg0OYDC4/i/2WRWAB6poM+XZ2dLUbcbE=
-github.com/russellhaering/goxmldsig v1.1.1 h1:vI0r2osGF1A9PLvsGdPUAGwEIrKa4Pj5sesSBsebIxM=
-github.com/russellhaering/goxmldsig v1.1.1/go.mod h1:gM4MDENBQf7M+V824SGfyIUVFWydB7n0KkEubVJl+Tw=
+github.com/russellhaering/goxmldsig v1.2.0 h1:Y6GTTc9Un5hCxSzVz4UIWQ/zuVwDvzJk80guqzwx6Vg=
+github.com/russellhaering/goxmldsig v1.2.0/go.mod h1:gM4MDENBQf7M+V824SGfyIUVFWydB7n0KkEubVJl+Tw=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
@@ -52,6 +52,7 @@ golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

schema.go

@@ -764,7 +764,7 @@ func (a *Assertion) Element() *etree.Element {
 	for _, attributeStatement := range a.AttributeStatements {
 		el.AddChild(attributeStatement.Element())
 	}
-	err := etreeutils.TransformExcC14n(el, canonicalizerPrefixList)
+	err := etreeutils.TransformExcC14n(el, canonicalizerPrefixList, false)
 	if err != nil {
 		panic(err)
 	}

service_provider_test.go

@@ -771,7 +771,7 @@ func TestSPRejectsInjectedComment(t *testing.T) {
 	// it *MUST NOT* validate
 	{
 		x, _ := base64.StdEncoding.DecodeString(string(SamlResponse))
-		y := strings.Replace(string(x), "ross@octolabs.io", "ross@octolabs.io<!-- and a comment -->.example.com", 1)
+		y := strings.Replace(string(x), "ross@<!-- and a comment -->octolabs.io", "ross@octolabs.io<!-- and a comment -->.example.com", 1)
 		SamlResponse = []byte(base64.StdEncoding.EncodeToString([]byte(y)))
 
 		req := http.Request{PostForm: url.Values{}}