Adds a comma after SS3 and before the description

README.md

@@ -3,7 +3,7 @@ ss3sim
 
 main: [![R-CMD-check](https://github.com/ss3sim/ss3sim/workflows/R-CMD-check/badge.svg)](https://github.com/ss3sim/ss3sim/actions?query=workflow%3AR-CMD-check) [![CRAN\_Status\_Badge](http://www.r-pkg.org/badges/version/ss3sim)](https://cran.r-project.org/package=ss3sim)
 
-{ss3sim} is an R package that simplifies the steps needed to generate beautiful simulation output from the widely-used [Stock Synthesis](https://github.com/nmfs-stock-synthesis/stock-synthesis) (SS3) statistical age-structured stock assessment framework. To learn more, read on or check out the [vignettes](https://ss3sim.github.io/ss3sim/).
+{ss3sim} is an R package that simplifies the steps needed to generate beautiful simulation output from the widely-used [Stock Synthesis](https://github.com/nmfs-stock-synthesis/stock-synthesis) (SS3), a statistical age-structured stock assessment framework. To learn more, read on or check out the [vignettes](https://ss3sim.github.io/ss3sim/).
 
 -   [Badges](#badges)
 -   [Installation](#installation)