doc(readme): minor improvement

Author: rafamizes

README.md

@@ -27,7 +27,7 @@ simply declare `InstagramGrad().colors` — the 'Grad' suffix is short for
 _Gradient_.
 
 To get a single color: `Instagram.royalBlue().color`, for Instagram
-royal blue;`Instagram.yellow().color`, for Instagram yellow.
+royal blue;`Instagram.yellow().color`, for Instagram yellow; and so on.
 
 In addition, each class is well-documented and fully unit-tested — this package
 has achieved 100% code coverage and goes through a CI pipeline with rigorous