CHANGELOG.md: add print-deps line (#778)

* CHANGELOG.md: add print-deps line

Author: estroz

CHANGELOG.md

@@ -4,6 +4,10 @@
 
 - The SDK now uses logr as the default logger to unify the logging output with the controller-runtime logs. Users can still use a logger of their own choice. See the [logging doc](https://github.com/operator-framework/operator-sdk/blob/master/doc/user/logging.md) on how the SDK initializes and uses logr.
 
+### Added
+
+- A new command [`operator-sdk print-deps`](https://github.com/operator-framework/operator-sdk/blob/master/doc/sdk-cli-reference.md#print-deps) which prints Golang packages and versions expected by the current Operator SDK version. Supplying `--as-file` prints packages and versions in Gopkg.toml format. ([#772](https://github.com/operator-framework/operator-sdk/pull/772))
+
 ### Bug fixes
 
 - Make operator-sdk command work with composed GOPATH ([#676](https://github.com/operator-framework/operator-sdk/pull/676))