docs(readme): add percent scale in plot

Author: m-muecke

DESCRIPTION

@@ -23,6 +23,7 @@ Imports:
 Suggests:
     ggplot2,
     readxl,
+    scales,
     testthat (>= 3.0.0)
 Config/testthat/edition: 3
 Encoding: UTF-8

README.Rmd

@@ -71,16 +71,15 @@ subset(yield_curve, maturity == "10 year") |>
     legend.title = element_blank(),
     legend.position = "top",
     plot.title = element_text(face = "bold"),
-    plot.caption = element_text(
-      hjust = 0, vjust = 0, size = 8, margin = margin(10, 0, 0, 0)
-    ),
-    panel.grid.major.y = element_line(color = "black", linewidth = 0.2),
+    plot.caption = element_text(hjust = 0, vjust = 0, size = 8, margin = margin(10, 0, 0, 0)),
     panel.grid.major.x = element_blank(),
+    panel.grid.major.y = element_line(color = "black", linewidth = 0.2),
     panel.grid.minor = element_blank(),
     axis.text = element_text(color = "black"),
     axis.title = element_blank(),
     plot.margin = margin(10, 10, 10, 10)
   ) +
+  scale_y_continuous(labels = scales::label_percent(scale = 1L)) +
   labs(title = "US Treasury Yield Curve 2023 (10 Year Maturity)")
 ```