Multiline value fix - multi line strings no longer printed as a yaml block

Although printing the string as a yaml block can be argued to be technically correct, in practical terms it's more useful to just print out the multiline string as is.

examples/multiline-text.yaml

@@ -0,0 +1,5 @@
+test: |
+  abcdefg    
+  hijklmno
+
+

snap/snapcraft.yaml

@@ -1,5 +1,5 @@
 name: yq
-version: 1.14.0
+version: 1.14.1
 summary: A lightweight and portable command-line YAML processor
 description: |
   The aim of the project is to be the jq or sed of yaml files.

version.go

@@ -11,7 +11,7 @@ var (
 	GitDescribe string
 
 	// Version is main version number that is being run at the moment.
-	Version = "1.14.0"
+	Version = "1.14.1"
 
 	// VersionPrerelease is a pre-release marker for the version. If this is "" (empty string)
 	// then it means that it is a final release. Otherwise, this is a pre-release

yq.go

@@ -417,10 +417,21 @@ func toString(context interface{}) (string, error) {
 }
 
 func yamlToString(context interface{}) (string, error) {
+	switch context.(type) {
+	case string:
+		return context.(string), nil
+	default:
+		return marshalContext(context)
+	}
+}
+
+func marshalContext(context interface{}) (string, error) {
 	out, err := yaml.Marshal(context)
+
 	if err != nil {
 		return "", fmt.Errorf("error printing yaml: %v", err)
 	}
+
 	outStr := string(out)
 	// trim the trailing new line as it's easier for a script to add
 	// it in if required than to remove it

yq_test.go

@@ -47,6 +47,14 @@ application: MyApp`,
 		formattedResult)
 }
 
+func TestMultilineString(t *testing.T) {
+	testString := `
+	abcd
+	efg`
+	formattedResult, _ := yamlToString(testString)
+	assertResult(t, testString, formattedResult)
+}
+
 func TestNewYaml(t *testing.T) {
 	result, _ := newYaml([]string{"b.c", "3"})
 	formattedResult := fmt.Sprintf("%v", result)