Feature: updated README.md file for wp theme update command

Author: up1512001

README.md

@@ -1378,6 +1378,12 @@ wp theme update [<theme>...] [--all] [--exclude=<theme-names>] [--format=<format
 	[--exclude=<theme-names>]
 		Comma separated list of theme names that should be excluded from updating.
 
+    [--minor]
+        Only perform updates for minor releases (e.g. from 1.3 to 1.4 instead of 2.0)
+
+    [--patch]
+        Only perform updates for patch releases (e.g. from 1.3 to 1.3.3 instead of 1.4)
+
 	[--format=<format>]
 		Render output in a particular format.
 		---