Add 'gamair' to list of packages in README

Author: tlienart

Diff for: README.md

@@ -34,6 +34,7 @@ boot         | Bootstrap Functions (Originally by Angelo Canty for S)
 car          | Companion to Applied Regression
 cluster      | Cluster Analysis Extended Rousseeuw et al.
 datasets     | The R Datasets Package
+gamair       | Datasets used in the book Generalized Additive Models: An Introduction with R
 gap          | Genetic analysis package
 ggplot2      | An Implementation of the Grammar of Graphics
 lattice      | Lattice Graphics