add v2.0 changelog updates

CHANGELOG.rst

@@ -1,12 +1,20 @@
 CHANGELOG
 =========
 
-v1.9 (TBD)
------------
+v2.0 (Apr 16th, 2024)
+----------------------
 
 **Major Changes**
 
+This release comes with several improvements to batch scheduler integration including code refactoring of all schedulers. We have
+added supported for Torque scheduler. Furthermore, we have changed logic for PBS scheduler for polling jobs to be consistent with Torque
+since both schedulers are very similar. We have improved logging for batch jobs and scheduler detection. Furthermore we have added validation
+for queues to ensure executor validation takes place to invalidate an executor if queue is not found.
+
 - Add support for Torque batch scheduler `#1734 <https://github.com/buildtesters/buildtest/pull/1734>`_
+- Improve scheduler detection logic `#1738 <https://github.com/buildtesters/buildtest/pull/1738>`_, `#1739 <https://github.com/buildtesters/buildtest/pull/1739>`_
+- Change poll command to `qstat -xf` for PBS scheduler and `qstat -f` for Torque `#1746 <https://github.com/buildtesters/buildtest/pull/1746/>`_
+- Improvement to LSF executors such as queue validation and testing LSF executors on OLCF system on Summit `#1748 <https://github.com/buildtesters/buildtest/pull/1748>`_, `#1750 <https://github.com/buildtesters/buildtest/pull/1750>`_
 
 **Buildspecs Changes**
 
@@ -26,15 +34,15 @@ v1.9 (TBD)
 
 - Build prototype for AWS tutorial that includes several example buildspecs, configuration file and improvement to ``buildtest tutorial-examples`` command to help auto-generate examples. For instance we added positional argument to specify either ``buildtest tutorial-examples {aws,spack}`` which will be used to generate example docs for each section `#1719 <https://github.com/buildtesters/buildtest/pull/1719>`_
 - Rearrange documentation pages to move all status checks into single page `#1733 <https://github.com/buildtesters/buildtest/pull/1733>`_
+- Add documentation for Torque Executors `#1743 <https://github.com/buildtesters/buildtest/pull/1743>`_
+- Add documentation for LSF Executors `#1745 <https://github.com/buildtesters/buildtest/pull/1745>`_
 
 **Project Improvements**
 
 - Add github workflow to run regression test examples with spack using github action `spack/setup-spack <https://github.com/spack/setup-spack>`_  to help increase code coverage for spack schema `#1716 <https://github.com/buildtesters/buildtest/pull/1716>`_
 - Change singularity invocation from **singularity exec** to **singularity run** when running singularity containers `#1711 <https://github.com/buildtesters/buildtest/pull/1711>`_
 - Fix a bug in argparser invocation when running ``buildtest --help-all`` that caused an error with showing all help options. `#1708 <https://github.com/buildtesters/buildtest/pull/1708>`_
 
-
-
 v1.8 (Feb 14th, 2024)
 ----------------------