Add new CHANGELOG section (#5580)

Author: carmocca

CHANGELOG.md

@@ -5,11 +5,29 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 
-## [1.1.5] - 2021-01-19
+## [unreleased.Bugfixes] - YYYY-MM-DD
+
+### Added
+
+
+### Changed
+
+
+### Deprecated
+
+
+### Removed
+
 
 ### Fixed
 
 
+
+
+## [1.1.5] - 2021-01-19
+
+### Fixed
+
 - Fixed a visual bug in the progress bar display initialization ([#4579](https://github.com/PyTorchLightning/pytorch-lightning/pull/4579))
 - Fixed logging `on_train_batch_end` in a callback with multiple optimizers ([#5521](https://github.com/PyTorchLightning/pytorch-lightning/pull/5521))
 - Fixed `reinit_scheduler_properties` with correct optimizer ([#5519](https://github.com/PyTorchLightning/pytorch-lightning/pull/5519))

tests/checkpointing/test_legacy_checkpoints.py

@@ -46,6 +46,7 @@
     "1.1.2",
     "1.1.3",
     "1.1.4",
+    "1.1.5",
 ])
 def test_resume_legacy_checkpoints(tmpdir, pl_version):
     path_dir = os.path.join(LEGACY_CHECKPOINTS_PATH, pl_version)