Sudan switches from +03 to +02 on 2017-11-01

(Thanks to Ahmed Atyya.)
* NEWS: Document this.
* africa (Africa/Khartoum): Implement it.  Guess 00:00 for the
transition time.

NEWS

@@ -4,6 +4,7 @@ Unreleased, experimental changes
 
   Briefly: Fiji ends DST 2018-01-14, not 2018-01-21.
   Namibia switches from +01/+02 to +02 on 2018-04-01.
+  Sudan switches from +03 to +02 on 2017-11-01.
   Turks & Caicos switches from -04 to -05/-04 on 2018-11-04.
   A new file tzdata.zi now holds a small text copy of all data.
   The zic input format has been regularized slightly.
@@ -18,6 +19,9 @@ Unreleased, experimental changes
     2017-09-03 at 02:00.  This affects UT offsets starting 2018-04-01
     at 02:00.  (Thanks to Steffen Thorsen.)
 
+    Sudan will switch from +03 to +02 on 2017-11-01.
+    (Thanks to Ahmed Atyya.)
+
     Turks & Caicos will switch from -04 all year to -05 with US DST on
     2018-03-11 at 03:00.  This affects UT offsets starting 2018-11-04
     at 02:00.  (Thanks to Steffen Thorsen.)

africa

@@ -1081,6 +1081,10 @@ Link Africa/Johannesburg Africa/Mbabane    # Swaziland
 # Saturday....  This was announced Thursday by Caretaker State Minister for
 # Manpower Abdul-Rahman Nur-Eddin.
 #
+# From Ahmed Atyya, National Telecommunications Corp., Sudan (2017-10-17):
+# ... the Republic of Sudan is going to change the time zone from (GMT+3:00)
+# to (GMT+ 2:00) starting from Wednesday 1 November 2017.
+#
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	Sudan	1970	only	-	May	 1	0:00	1:00	S
 Rule	Sudan	1970	1985	-	Oct	15	0:00	0	-
@@ -1089,7 +1093,8 @@ Rule	Sudan	1972	1985	-	Apr	lastSun	0:00	1:00	S
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Khartoum	2:10:08 -	LMT	1931
 			2:00	Sudan	CA%sT	2000 Jan 15 12:00
-			3:00	-	EAT
+			3:00	-	EAT	2017 Nov  1
+			2:00	-	CAT
 
 # South Sudan
 Link Africa/Khartoum Africa/Juba