Update ICU to 58.1

source/data/translit/el_Lower.txt

Index: source/data/translit/el_Lower.txt
diff --git a/source/data/translit/el_Lower.txt b/source/data/translit/el_Lower.txt
index ac96ae3fb7f030ed9b0d1a0c08584387e13407bf..06eaf407658fec18b06511b21a5324fbfe523f66 100644
--- a/source/data/translit/el_Lower.txt
+++ b/source/data/translit/el_Lower.txt
@@ -1,14 +1,18 @@
-# ***************************************************************************
-# *
-# *  Copyright (C) 2004-2015, International Business Machines
-# *  Corporation; Unicode, Inc.; and others.  All Rights Reserved.
-# *
-# ***************************************************************************
+# © 2016 and later: Unicode, Inc. and others.
+# License & terms of use: http://www.unicode.org/copyright.html#License
+#
 # File: el_Lower.txt
-# Generated from CLDR 
+# Generated from CLDR
 #
+
+# Special case for final form of sigma.
 ::NFD();
+# C is preceded by a sequence consisting of a cased letter and then zero or more case-ignorable characters,
+# and C is not followed by a sequence consisting of zero or more case-ignorable characters and then a cased letter.
+# 03A3; 03C2; 03A3; 03A3; Final_Sigma; # GREEK CAPITAL LETTER SIGMA
+# With translit rules, easiest is to handle the negative condition first, mapping in that case to the regular sigma.
 Σ } [:case-ignorable:]* [:cased:] → σ;
 [:cased:] [:case-ignorable:]* { Σ → ς;
 ::Any-Lower;
 ::NFC();
+