deprecate panicking functions

Author: ludusrusso

object.go

@@ -232,6 +232,7 @@ func (obj *Object) GetInt64(attr string) (int64, error) {
 }
 
 // MustGetInt64 is like GetInt64, but it panic in case of error.
+// Deprecated: use GetInt64 instead
 func (obj *Object) MustGetInt64(attr string) int64 {
 	result, err := obj.GetInt64(attr)
 	if err != nil {
@@ -255,6 +256,7 @@ func (obj *Object) GetFloat64(attr string) (float64, error) {
 }
 
 // MustGetFloat64 is like GetFloat64, but it panic in case of error.
+// Deprecated: use GetFloat64 instead
 func (obj *Object) MustGetFloat64(attr string) float64 {
 	result, err := obj.GetFloat64(attr)
 	if err != nil {
@@ -278,6 +280,7 @@ func (obj *Object) GetString(attr string) (s string, err error) {
 }
 
 // MustGetString is like GetString, but it panic in case of error.
+// Deprecated: use GetString instead
 func (obj *Object) MustGetString(attr string) string {
 	result, err := obj.GetString(attr)
 	if err != nil {
@@ -302,6 +305,7 @@ func (obj *Object) GetTime(attr string) (t time.Time, err error) {
 }
 
 // MustGetTime is like GetTime, but it panic in case of error.
+// Deprecated: use GetTime instead
 func (obj *Object) MustGetTime(attr string) time.Time {
 	result, err := obj.GetTime(attr)
 	if err != nil {
@@ -325,6 +329,7 @@ func (obj *Object) GetBool(attr string) (b bool, err error) {
 }
 
 // MustGetBool is like GetTime, but it panic in case of error.
+// Deprecated: use GetBool instead
 func (obj *Object) MustGetBool(attr string) bool {
 	result, err := obj.GetBool(attr)
 	if err != nil {
@@ -358,6 +363,7 @@ func (obj *Object) GetStringSlice(attr string) (s []string, err error) {
 }
 
 // MustGetStringSlice is like GetStringSlice, but it panic in case of error.
+// Deprecated: use GetStringSlice instead
 func (obj *Object) MustGetStringSlice(attr string) []string {
 	result, err := obj.GetStringSlice(attr)
 	if err != nil {

vt.go

@@ -64,20 +64,32 @@ func (e Error) Error() string {
 	return e.Message
 }
 
-// URL returns a full VirusTotal API URL from a relative path (i.e: a path
+// NewURL returns a full VirusTotal API URL from a relative path (i.e: a path
 // without the domain name and the "/api/v3/" prefix). The path can contain
 // format 'verbs' as defined in the "fmt". This function is useful for creating
 // URLs to be passed to any function expecting a *url.URL in this library.
-func URL(pathFmt string, a ...interface{}) *url.URL {
+func NewURL(pathFmt string, a ...interface{}) (*url.URL, error) {
 	path := fmt.Sprintf(pathFmt, a...)
 	url, err := url.Parse(path)
 	if err != nil {
-		msg := fmt.Sprintf(
+		return nil, fmt.Errorf(
 			"error formatting URL \"%s\": %s",
 			pathFmt, err)
-		panic(msg)
 	}
-	return baseURL.ResolveReference(url)
+	return baseURL.ResolveReference(url), nil
+}
+
+// URL returns a full VirusTotal API URL from a relative path (i.e: a path
+// without the domain name and the "/api/v3/" prefix). The path can contain
+// format 'verbs' as defined in the "fmt". This function is useful for creating
+// URLs to be passed to any function expecting a *url.URL in this library.
+// Deprecated: use NewURL instead
+func URL(pathFmt string, a ...interface{}) *url.URL {
+	url, err := NewURL(pathFmt, a...)
+	if err != nil {
+		panic(err.Error())
+	}
+	return url
 }
 
 // SetHost allows to change the host used while sending requests to the