[U-Boot] [PATCH] README: Fix description of version numbering scheme

[Thomas Weber]

The version numbering scheme was changed in Oct, 2008.
This patch brings the documentation to the actual level.
The description is taken from: 
http://www.denx.de/wiki/U-Boot/ReleaseCycle

Signed-off-by: Thomas Weber <weber at corscience.de>
---
 README |   18 ++++++++++--------
 1 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/README b/README
index ccaace7..58ef06a 100644
--- a/README
+++ b/README
@@ -126,14 +126,16 @@ the string "u_boot" or on "U_BOOT". Example:
 Versioning:
 ===========
 
-U-Boot uses a 3 level version number containing a version, a
-sub-version, and a patchlevel: "U-Boot-2.34.5" means version "2",
-sub-version "34", and patchlevel "4".
-
-The patchlevel is used to indicate certain stages of development
-between released versions, i. e. officially released versions of
-U-Boot will always have a patchlevel of "0".
-
+Starting with the release in October 2008, the names of the releases were
+changed from numerical release numbers without deeper meaning into a
+time stamp based numbering. Regular releases are identified by names
+consisting of the calendar year and month of the release date.
+Additional fields (if present) indicate intermediate (hot fix) releases,
+and bug fix releases in "stable" maintenance trees.
+
+Examples:
+	U-Boot v2010.09-rc1	- version September 2010, release candidate 1
+	U-Boot v2009.11.1	- version November 2009, bug fix release 1
 
 Directory Hierarchy:
 ====================
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1.7.3