message: chore(ci): test FFI on CI using nightly
  Now that FFI is opt-in using cargo's --crate-type, nightly needs to be used
  on CI: this flag is still unstable and requires a nightly to enable -Z unstable options.
diff: @@ -157,7 +157,7 @@ jobs:
  uses: actions-rs/toolchain@v1
  with:
  profile: minimal
  - toolchain: stable
  + toolchain: nightly
  override: true
  - name: Install cbindgen
  @@ -171,8 +171,8 @@ jobs:
  env:
  RUSTFLAGS: --cfg hyper_unstable_ffi
  with:
  - command: build
  - args: --features client,http1,http2,ffi
  + command: rustc
  + args: --features client,http1,http2,ffi -Z unstable-options --crate-type cdylib
  - name: Make Examples
  run: cd capi/examples && make client
  