fix README.md badges (now need https) and add more

README.md

@@ -5,18 +5,19 @@ state and is being actively
 developed.](http://www.repostatus.org/badges/latest/active.svg)](https://www.repostatus.org/)
 [![CRAN\_Status\_Badge](https://www.r-pkg.org/badges/version/gsw)](https://cran.r-project.org/package=gsw)
 [![R-CMD-check](https://github.com/TEOS-10/GSW-R/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/TEOS-10/GSW-R/actions/workflows/R-CMD-check.yaml)
-![RStudio CRAN mirror downloads](http://cranlogs.r-pkg.org/badges/last-month/gsw)
-![RStudio CRAN mirror downloads](http://cranlogs.r-pkg.org/badges/last-week/gsw)
-![RStudio CRAN mirror downloads](http://cranlogs.r-pkg.org/badges/last-day/gsw)
+[![R-hub](https://github.com/dankelley/GSW-R/actions/workflows/rhub.yaml/badge.svg)](https://github.com/dankelley/GSW-R/actions/workflows/rhub.yaml)
+![RStudio CRAN mirror downloads](https://cranlogs.r-pkg.org/badges/last-month/gsw)
+![RStudio CRAN mirror downloads](https://cranlogs.r-pkg.org/badges/last-week/gsw)
+![RStudio CRAN mirror downloads](https://cranlogs.r-pkg.org/badges/last-day/gsw)
 ![RStudio CRAN mirror downloads](https://cranlogs.r-pkg.org/badges/grand-total/gsw)
 
 gsw is an R package that provides a connection to software relating to TEOS,
-the Thermodynamic Equation Of Seawater (see http://www.teos-10.org). This
+the Thermodynamic Equation Of Seawater (see <http://www.teos-10.org>). This
 connection involves R wrappers to C functions within the GSW-C library
-(https://github.com/TEOS-10/GSW-C, release v3.06-16-0, commit
+(<https://github.com/TEOS-10/GSW-C>, release v3.06-16-0, commit
 657216dd4f5ea079b5f0e021a4163e2d26893371), along with a data file within the
 GSW-Matlab library
-(https://github.com/TEOS-10/GSW-Matlab/blob/master/Toolbox/library/gsw_data_v3_0.mat,
+(<https://github.com/TEOS-10/GSW-Matlab/blob/master/Toolbox/library/gsw_data_v3_0.mat>,
 commit 38c9635d6fd93e74c2648e4ee23cec49c1f58530).
 
 The foundational algorithms upon which both GSW-C and GSW-R rest were devised
@@ -26,12 +27,11 @@ recommended as a replacement for a previous system (called UNESCO-80) at the
 twenty-fifth assembly in the Intergovernmental Oceanographic Commission in
 2009.
 
-The gsw functions reproduce test values in the GSW-Matlab documentation to
-a tolerance of 1.5e-8, the default for numerical comparison in R working on
-a 64-bit machine.  This offers some assurance that the coding process
-has not introduced errors.
+The gsw functions reproduce test values in the GSW-Matlab documentation to a
+tolerance of 1.5e-8, the default for numerical comparison in R working on a
+64-bit machine.  This offers some assurance that the coding process has not
+introduced errors.
 
 The naming convention in gsw is patterned on the system described at
-http://www.teos-10.org/pubs/gsw/html/gsw_contents.html, as a way to reduce the
-effort users might face in switching to R.
-
+<http://www.teos-10.org/pubs/gsw/html/gsw_contents.html>, as a way to reduce
+the effort users might face in switching to R.