tidyselect compat

targets 0.13.5

• Use any_of() instead of all_of() in tests to ensure compatibility with tidyselect 1.1.2.9000 (#928, @hadley).
• Make the run.R from use_targets() executable (#929, @petrbouchal).
• Add #!/usr/bin/env Rscript to the top of run.R from use_targets() (#929, @petrbouchal).