Bump cling version to 1.3~dev.

VERSION

@@ -1 +1 @@
-1.2
+1.3~dev

docs/ReleaseNotes.md

@@ -2,15 +2,15 @@ Introduction
 ============
 
 This document contains the release notes for the interactive C++ interpreter
-Cling, release 1.2. Cling is built on top of [Clang](http://clang.llvm.org) and
+Cling, release 1.3. Cling is built on top of [Clang](http://clang.llvm.org) and
 [LLVM](http://llvm.org>) compiler infrastructure. Here we
 describe the status of Cling in some detail, including major
 improvements from the previous release and new feature work.
 
 Note that if you are reading this file from a git checkout or the main Cling
 web page, this document applies to the *next* release, not the current one.
 
-What's New in Cling 1.2?
+What's New in Cling 1.3?
 ========================
 
 Some of the major new features and improvements to Cling are listed
@@ -19,17 +19,15 @@ infrastructure are described first.
 
 External Dependencies
 ---------------------
-* Upgrade to LLVM18.
+* Upgrade to LLVM r0000000.
 
 Major New Features
 ------------------
-* Improvements in stability
+* A major new feature
 
 Misc
 ----
-* Better handling of llvm::Error
-* Better integration with Clad
-* Modulemap fixes
+* A misc feature
 
 Experimental Features
 ---------------------
@@ -42,7 +40,14 @@ Jupyter
 
 Fixed Bugs
 ----------
-[16654](https://github.com/root-project/cling/issues/16654)
+[ROOT-XXXX](https://sft.its.cern.ch/jira/browse/ROOT-XXXX)
+
+<!---Get release bugs
+git log v1.2..master | grep -i "fix" | grep '#' | sed -E 's,.*\#([0-9]*).*,\[\1\]\(https://github.com/root-project/cling/issues/\1\),g' | sort
+--->
+<!---Standard MarkDown doesn't support neither variables nor <base>
+[ROOT-XXX](https://sft.its.cern.ch/jira/browse/ROOT-XXX)
+--->
 
 <!---Additional Information
 ----------------------
@@ -63,14 +68,7 @@ listed in the form of Firstname Lastname (#contributions):
 
 FirstName LastName (#commits)
 
-Devajith Valaparambil Sreeramaswamy (22)
-Jonas Hahnfeld (18)
-Jonas Rembser (2)
-Bertrand Bellenot (2)
-ferdymercury (1)
-dbonner (1)
-Vipul Cariappa (1)
-Vassil Vassilev (1)
-Fredrik (1)
-Danilo Piparo (1)
-Aaron Jomy (1)
+<!---Find contributor list for this release
+git log --pretty=format:"%an"  v1.2...master | sort | uniq -c | sort -rn |\
+  sed -E 's,^ *([0-9]+) (.*)$,\2 \(\1\),'
+--->