message: Update travis install warning
diff: #!/bin/bash
  curl -sL https://github.com/xd009642/tarpaulin/releases/download/0.10.2/cargo-tarpaulin-0.10.2-travis.tar.gz | tar xvz -C $HOME/.cargo/bin
  -echo "WARNING This method is no longer recommended. Use docker or crates.io to install tarpaulin"
  +echo "WARNING This install method may fail if using nightly features like doctest coverage. Consider using docker installs instead"
  