chore: update changelog post dfx 0.11.0
Just updates the changelog so that changes after dfx 0.11.0 go in the right place
`+dfx build+`, in Rust canisters, now uses the `+--locked+` flag when building with Cargo. To offset this, `+dfx new --type rust+` now runs `+cargo update+` on the resulting project.
+= 0.11.0
+
+== DFX
+
=== feat: renamed canisters in new projects to <project>_frontend and <project>_backend
The names of canisters created for new projects have changed.
