Update vendor (#1228)

vendor/github.com/spf13/viper/util.go

@@ -91,13 +91,22 @@ func insensitiviseMap(m map[string]interface{}) {
 func absPathify(inPath string) string {
 	jww.INFO.Println("Trying to resolve absolute path to", inPath)
 
-	if strings.HasPrefix(inPath, "$HOME") {
+	if inPath == "$HOME" || strings.HasPrefix(inPath, "$HOME"+string(os.PathSeparator)) {
 		inPath = userHomeDir() + inPath[5:]
 	}
 
 	if strings.HasPrefix(inPath, "$") {
 		end := strings.Index(inPath, string(os.PathSeparator))
-		inPath = os.Getenv(inPath[1:end]) + inPath[end:]
+
+		var value, suffix string
+		if end == -1 {
+			value = os.Getenv(inPath[1:])
+		} else {
+			value = os.Getenv(inPath[1:end])
+			suffix = inPath[end:]
+		}
+
+		inPath = value + suffix
 	}
 
 	if filepath.IsAbs(inPath) {