Build Spec: Update Version to 1.28

Cc: Liming Gao <[email protected]>
Cc: Michael Kinney <[email protected]>
Cc: Kevin W Shaw <[email protected]>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Yonghong Zhu <[email protected]>
Reviewed-by: Liming Gao <[email protected]>

Author: Yonghong Zhu

README.md

@@ -1,7 +1,7 @@
 <!--- @file
   README.md for EDK II Build Specification
 
-  Copyright (c) 2008-2017, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2008-2018, Intel Corporation. All rights reserved.<BR>
 
   Redistribution and use in source (original document form) and 'compiled'
   forms (converted to PDF, epub, HTML and other formats) with or without
@@ -219,3 +219,9 @@ Copyright (c) 2008-2017, Intel Corporation. All rights reserved.
 |            | [#669](https://bugzilla.tianocore.org/show_bug.cgi?id=669) Build Spec: Add multi-arg support to PREBUILD/POSTBUILD                                                                                                                                                                                                                                                  |               |
 |            | [#717](https://bugzilla.tianocore.org/show_bug.cgi?id=717) Build Spec: Build report to display every module's build time                                                                                                                                                                                                                                            |               |
 |            | [#689](https://bugzilla.tianocore.org/show_bug.cgi?id=689) Build spec: add description for build with binary cache                                                                                                                                                                                                                                                  |               |
+| 1.28       | Add clarification for the binary cache files                                                                                                                                                                                                                                                                                                                        | Mar 2018      |
+|            | [#775](https://bugzilla.tianocore.org/show_bug.cgi?id=775) Build spec: Add description about auto detect thread number                                                                                                                                                                                                                                              |               |
+|            | Add Flexible PCD value format into spec                                                                                                                                                                                                                                                                                                                             |               |
+|            | Update PCD value and SKU, DefaultStore info in build report                                                                                                                                                                                                                                                                                                         |               |
+|            | Clarify structure PCD field value assignment precedence                                                                                                                                                                                                                                                                                                             |               |
+|            | Update description for build handles PCDs for SKU support                                                                                                                                                                                                                                                                                                           |               |