update the Description field to match latest requirements in WRE

DESCRIPTION

@@ -10,7 +10,7 @@ Authors@R: c(person(given = "Gavin L.", family = "Simpson",
              person(given = "Jari", family = "Oksanen", role = "ctb"))
 Depends: R (>= 2.14.0)
 Suggests: vegan (>= 2.0-0), testthat (>= 0.5), parallel
-Description: The 'permute' package implements a set of restricted permutation designs for freely exchangeable, line transects (time series), and spatial grid designs plus permutation of blocks (groups of samples). 'permute' also allows split-plot designs, in which the whole-plots or split-plots or both can be freely-exchangeable or one of the restricted designs. The 'permute' package is modelled after the permutation schemes of Canoco 3.1 (and later) by Cajo ter Braak.
+Description: A set of restricted permutation designs for freely exchangeable, line transects (time series), and spatial grid designs plus permutation of blocks (groups of samples) is provided. 'permute' also allows split-plot designs, in which the whole-plots or split-plots or both can be freely-exchangeable or one of the restricted designs. The 'permute' package is modelled after the permutation schemes of 'Canoco 3.1' (and later) by Cajo ter Braak.
 License: GPL-2
 ByteCompile: true 
 URL: https://github.com/gavinsimpson/permute