Update vendored dependencies: libgin

vendor/github.com/G-Node/libgin/libgin/doi.go

@@ -6,12 +6,11 @@ import (
 	"encoding/hex"
 	"encoding/xml"
 	"fmt"
+	"log"
 	"net/http"
 	"regexp"
 	"strings"
 	"time"
-
-	log "github.com/Sirupsen/logrus"
 )
 
 // NOTE: TEMPORARY COPIES FROM gin-doi
@@ -73,7 +72,7 @@ func (c *DOIRegInfo) GetCitation() string {
 func (c *DOIRegInfo) EscXML(txt string) string {
 	buf := new(bytes.Buffer)
 	if err := xml.EscapeText(buf, []byte(txt)); err != nil {
-		log.Errorf("Could not escape:%s, %+v", txt, err)
+		log.Printf("Could not escape: %s :: %s", txt, err.Error())
 		return ""
 	}
 	return buf.String()
@@ -125,7 +124,7 @@ func IsRegisteredDOI(doi string) bool {
 	url := fmt.Sprintf("https://doi.org/%s", doi)
 	resp, err := http.Get(url)
 	if err != nil {
-		log.Errorf("Could not query for doi: %s at %s", doi, url)
+		log.Printf("Could not query for DOI: %s at %s", doi, url)
 		return false
 	}
 	if resp.StatusCode != http.StatusNotFound {

vendor/vendor.json

@@ -50,10 +50,10 @@
 			"revision": ""
 		},
 		{
-			"checksumSHA1": "ivLQm0J9hV8UR3+YYR7BugdZLsg=",
+			"checksumSHA1": "HM8GI780IYgrBjmQfEB8YXN4Gbs=",
 			"path": "github.com/G-Node/libgin/libgin",
-			"revision": "826bc3c293a0109c9c89cc5d463fc58156a240c0",
-			"revisionTime": "2018-12-12T19:25:09Z"
+			"revision": "c5e0b86f5b8b481b061df2926eea96e7e7793eca",
+			"revisionTime": "2018-12-13T18:01:10Z"
 		},
 		{
 			"checksumSHA1": "s+CthU3jnDZx1F6sOfsEvRLFjBE=",