Update ICU to 58.1

source/i18n/unicode/timezone.h

Index: source/i18n/unicode/timezone.h
diff --git a/source/i18n/unicode/timezone.h b/source/i18n/unicode/timezone.h
index 9fec21ec8fdb6f5cb1c2dab605acc72a22762026..8cfe7e5220e6917576b417e4feb1f816eb299f60 100644
--- a/source/i18n/unicode/timezone.h
+++ b/source/i18n/unicode/timezone.h
@@ -1,5 +1,7 @@
+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
 /*************************************************************************
-* Copyright (c) 1997-2015, International Business Machines Corporation
+* Copyright (c) 1997-2016, International Business Machines Corporation
 * and others. All Rights Reserved.
 **************************************************************************
 *
@@ -273,7 +275,6 @@ public:
     static const UnicodeString U_EXPORT2 getEquivalentID(const UnicodeString& id,
                                                int32_t index);
 
-#ifndef U_HIDE_DRAFT_API
     /**
      * Creates an instance of TimeZone detected from the current host
      * system configuration. Note that ICU4C does not change the default
@@ -285,10 +286,9 @@ public:
      *
      * @return  A new instance of TimeZone detected from the current host system
      *          configuration.
-     * @draft ICU 55
+     * @stable ICU 55
      */
     static TimeZone* U_EXPORT2 detectHostTimeZone();
-#endif  /* U_HIDE_DRAFT_API */
 
     /**
      * Creates a new copy of the default TimeZone for this host. Unless the default time