message: Create README file so tests pass
diff: @@ -1115,6 +1115,7 @@ fn package_metadata() {
  baz = "quux"
  "#,
  )
  + .file("README.md", "")
  .file("src/lib.rs", "")
  .build();
  @@ -1186,6 +1187,7 @@ fn package_publish() {
  publish = ["my-registry"]
  "#,
  )
  + .file("README.md", "")
  .file("src/lib.rs", "")
  .build();
  