undeclared dependency on R version >= 3.6.0

[tyner]

Some functions in the s3fs package make use of base::trimws with the whitespace argument. However, that argument is not available prior to R version 3.6.0.

So in older R versions:

foo <- s3_dir_ls("s3://foo/bar")

gives:

Error in trimws(path, which = "right", whitespace = "/") : 
  unused argument (whitespace = "/")

[DyfanJones]

Ah sorry about that. I guess I should include the package backport to ensure that all functions are available for old versions of R. I am currently on holiday at the moment, so will tackle this when I get back :) in the mean time I am open to any PRs :)

[tyner]

Rather than add a dependency on another package, my personal preference would be to explicitly declare the version dependency and move on.

[DyfanJones]

That is fair :)

[DyfanJones]

Sorry for the delay in this. PR #30 addresses issue. I will release it to the cran shortly

[DyfanJones]

Closing as s3fs 0.1.4 has been released to the cran