message: Add nightly to make commands
diff: # This will re-generate the Rust test files based on spectests/*.wast
  spectests:
  - WASM_GENERATE_SPECTESTS=1 cargo build
  + WASM_GENERATE_SPECTESTS=1 cargo +nightly build
  # clean:
  # rm -rf target
  build:
  - cargo build
  + cargo +nightly build
  install:
  - cargo install --path .
  + cargo +nightly install --path .
  test:
  - cargo test -- --test-threads=1
  + cargo +nightly test -- --test-threads=1
  