Maybe need .name_repair, according to warning message

[ciaranmci]

I followed the first example from the DiagrammeR webpage, running an R kernel (R 4.3.2) on jupyter notebook host on GoogleCloudPlatform. The plot rendered just fine but the following warning message was shown:

Warning message:
“The `x` argument of `as_tibble.matrix()` must have unique column names if
`.name_repair` is omitted as of tibble 2.0.0.
ℹ Using compatibility `.name_repair`.
ℹ The deprecated feature was likely used in the DiagrammeR package.
  Please report the issue at
  <[https://github.com/rich-iannone/DiagrammeR/issues>](https://github.com/rich-iannone/DiagrammeR/issues%3E.%E2%80%9D)[.”](https://github.com/rich-iannone/DiagrammeR/issues%3E.%E2%80%9D)

Just thought I should let you know.

[olivroy]

Thanks for the heads-up! Fixed in the dev version by PR #507. A new version should land on CRAN soon.