message: Don't fail the build if doc-upload fails.
diff: @@ -52,7 +52,7 @@ script:
  mdbook build;
  cd ..;
  cp -r book/book target/doc/book;
  - travis-cargo doc-upload;
  + travis-cargo doc-upload || true;
  else
  cargo build --release;
  cargo test --all --release;
  