fix ACM numbers

DESCRIPTION

@@ -17,9 +17,11 @@ Authors@R: c(person("Hiroshi", "Akima", role = c("aut", "cph"),
 Maintainer: Albrecht Gebhardt <albrecht.gebhardt@aau.at>
 Description: Several cubic spline interpolation methods of H. Akima for irregular and
   regular gridded data are available through this package, both for the bivariate case
-  (irregular data: ACM 526 and ACM 761, regular data: ACM 433) and univariate case (ACM 697).
+  (irregular data: ACM 761, regular data: ACM 760) and univariate case (ACM 433 and ACM 697).
   Linear interpolation of irregular gridded data is also covered by reusing D. J. Renkas
-  triangulation code which is part of Akimas Fortran code.
+  triangulation code which is part of Akimas Fortran code. A bilinear interpolator
+  for regular grids was also added for comparison with the bicubic interpolator on
+  regular grids.
 License: ACM | file LICENSE
 Depends: R (>= 2.0.0)
 Imports: sp