CHANGELOG.md: add 'breaking change' note to several changes (#2448)

Author: Eric Stroczynski

CHANGELOG.md

@@ -10,9 +10,9 @@
 
 - Changed error wrapping according to Go version 1.13+ [error handling](https://blog.golang.org/go1.13-errors). ([#2355](https://github.com/operator-framework/operator-sdk/pull/2355))
 - Added retry logic to the cleanup function from the e2e test framework in order to allow it to be achieved in the scenarios where temporary network issues are faced. ([#2277](https://github.com/operator-framework/operator-sdk/pull/2277))
-- Moved `olm-catalog gen-csv` to the `generate csv` subcommand. ([#2439](https://github.com/operator-framework/operator-sdk/pull/2439))
-- `run ansible/helm` are now the hidden commands `exec-entrypoint ansible/helm`. All functionality of each subcommand is the same. ([#2441](https://github.com/operator-framework/operator-sdk/pull/2441))
-- `up local` is now [`run --local`](./doc/cli/operator-sdk_run.md). All functionality of this command is the same. ([#2441](https://github.com/operator-framework/operator-sdk/pull/2441))
+- **Breaking Change:** Moved `olm-catalog gen-csv` to the `generate csv` subcommand. ([#2439](https://github.com/operator-framework/operator-sdk/pull/2439))
+- **Breaking Change:** `run ansible/helm` are now the hidden commands `exec-entrypoint ansible/helm`. All functionality of each subcommand is the same. ([#2441](https://github.com/operator-framework/operator-sdk/pull/2441))
+- **Breaking Change:** `up local` is now [`run --local`](./doc/cli/operator-sdk_run.md). All functionality of this command is the same. ([#2441](https://github.com/operator-framework/operator-sdk/pull/2441))
 - **Breaking Change:** Moved the `olm` subcommand from `alpha` to its own subcommand. All functionality of this command is the same. ([#2447](https://github.com/operator-framework/operator-sdk/pull/2447))
 
 ### Deprecated