message: Add -Zfeatures tracking issues.
diff: @@ -475,6 +475,10 @@ cargo +nightly -Zunstable-options -Zconfig-include --config somefile.toml build
  CLI paths are relative to the current working directory.
  ## Features
  +* Tracking Issues:
  + * [itarget #7914](https://github.com/rust-lang/cargo/issues/7914)
  + * [build_dep #7915](https://github.com/rust-lang/cargo/issues/7915)
  + * [dev_dep #7916](https://github.com/rust-lang/cargo/issues/7916)
  The `-Zfeatures` option causes Cargo to use a new feature resolver that can
  resolve features differently from before. It takes a comma separated list of
  