Error on: Biostrings is not avaiable for R-3.6.2

I have installed Biostrings R package in R version 3.6.2. When check with travis CI, I got the following error:
@jeroen and @jimhester
Error: (converted from warning) package ‘Biostrings’ is not available (for R version 3.6.2)

Execution halted

If your package depends on Bioconductor packages you need to specify that in your yaml file and ensure your package has a BiocViews: entry in the DESCRIPTION.

See https://docs.travis-ci.com/user/languages/r/#bioconductor for details

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