suggested small tweaks to README (#6612)

* ggplot2 is a lot older than 10 years, and I suggest referencing the major new version after saying 'ggplot2 itself changes relatively little' since there's been a significant change

* Removed last paragraph from README and rebuilt as requested

Author: smach

README.Rmd

@@ -64,7 +64,7 @@ ggplot(mpg, aes(displ, hwy, colour = class)) +
 
 [![lifecycle](https://img.shields.io/badge/lifecycle-stable-brightgreen.svg)](https://lifecycle.r-lib.org/articles/stages.html)
 
-ggplot2 is now over 10 years old and is used by hundreds of thousands of people to make millions of plots. That means, by-and-large, ggplot2 itself changes relatively little. When we do make changes, they will be generally to add new functions or arguments rather than changing the behaviour of existing functions, and if we do make changes to existing behaviour we will do them for compelling reasons.
+ggplot2 is now 18 years old and is used by hundreds of thousands of people to make millions of plots. That means, by-and-large, ggplot2 itself changes relatively little. When we do make changes, they will be generally to add new functions or arguments rather than changing the behaviour of existing functions, and if we do make changes to existing behaviour we will do them for compelling reasons.
 
 If you are looking for innovation, look to ggplot2's rich ecosystem of extensions. See a community maintained list at <https://exts.ggplot2.tidyverse.org/gallery/>.
 

README.md

@@ -59,7 +59,7 @@ ggplot(mpg, aes(displ, hwy, colour = class)) +
 
 [![lifecycle](https://img.shields.io/badge/lifecycle-stable-brightgreen.svg)](https://lifecycle.r-lib.org/articles/stages.html)
 
-ggplot2 is now over 10 years old and is used by hundreds of thousands of
+ggplot2 is now 18 years old and is used by hundreds of thousands of
 people to make millions of plots. That means, by-and-large, ggplot2
 itself changes relatively little. When we do make changes, they will be
 generally to add new functions or arguments rather than changing the