ggplot2 dependency deprecation

[Jiaquan-Woo]

1: aes_string() was deprecated in ggplot2 3.0.0.
ℹ Please use tidy evaluation idioms with aes().
ℹ See also vignette("ggplot2-in-packages") for more information.
ℹ The deprecated feature was likely used in the ggcoverage package.

2: Using size aesthetic for lines was deprecated in ggplot2 3.4.0.
ℹ Please use linewidth instead.
ℹ The deprecated feature was likely used in the ggcoverage package.

[m-jahn]

Dear @Jiaquan-Woo , I fully agree, many things about this package are cluttered or outdated. In general, code in this package is highly repetitive and probably not according to today's standards. The problem is that I have very little time to maintain this package and the original maintainer @showteeth does not react. If the package is not published on CRAN or bioconductor, the incentive for maintenance is very low for me.

Feel free to make a PR and fix issues, I can review.