Add trailing forward slash to URL

Author: alice-hannah

README.Rmd

@@ -137,7 +137,7 @@ Titles, subtitles and captions have been embedded in these example charts for de
 
 ## Related package
 
-sgplot is the basis for the [afcharts](https://best-practice-and-impact.github.io/afcharts) package, developed by the [Government Analysis Function](https://analysisfunction.civilservice.gov.uk/). The packages remain similar, with both following the [Analysis Function Data Visualisation guidance](https://analysisfunction.civilservice.gov.uk/policy-store/data-visualisation-charts/), however sgplot also uses guidance from the [Scottish Government Design System](https://designsystem.gov.scot/guidance/charts/data-visualisation-colour-palettes). 
+sgplot is the basis for the [afcharts](https://best-practice-and-impact.github.io/afcharts/) package, developed by the [Government Analysis Function](https://analysisfunction.civilservice.gov.uk/). The packages remain similar, with both following the [Analysis Function Data Visualisation guidance](https://analysisfunction.civilservice.gov.uk/policy-store/data-visualisation-charts/), however sgplot also uses guidance from the [Scottish Government Design System](https://designsystem.gov.scot/guidance/charts/data-visualisation-colour-palettes). 
 
 Scottish Government analysts should continue to use sgplot, rather than afcharts.