Update ChangeLog

Signed-off-by: Haytham Abuelfutuh <[email protected]>

CHANGELOG/CHANGELOG-v0.12.0.md

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+# General
+* Added CoPilot configuration to sandbox manifest
+* Updated and streamlined documentation navigation and themes.  Better content organization coming soon!
+
+# Performance
+* Improved execution performance including:
+  - Reduced cache lookups
+  - Improved GetWorkflowExecution performance
+  - Capped max number of nodes in each propeller round
+  - Misc. propeller performance tweaks
+* TaskTemplate offloading
+
+# Housekeeping
+* Migrated Datacatalog protobuf definitions to flyteidl [thanks @tnsetting]
+* Upgraded stow version used in flytestdlib
+* Moved off lyft kubernetes forks and onto official kubernetes library dependencies
+* Revamped pod tasks to use official kubernetes python client library for defining PodSpecs
+
+# Events
+* Richer event metadata for task executions
+* Better merging of custom info across task events
+
+# Bug fixes
+* Resolved non-backwards protobuf role changes that prevented launching single task executions
+* Better handling of large workflows and errors in flytepropeller
+
+# Flytekit (Python)
+* Access to secrets
+* Bug fixes around the 0.16 release.
+  * Use original FlyteFile/FlyteDirectory 
+  * Fix serialization of pod specs in pod plugin [thanks @jeevb]
+  * Accept auth role arg in single task execution
+  * Fixed task resolver in map task
+  * Requests and limits added to ContainerTask [thanks @migueltol22]
+