eliminate thinko version check

Author: jefferis

R/coordinates.R

@@ -122,7 +122,6 @@ coord2ind <- function(coords, ...) UseMethod("coord2ind")
 coord2ind.default<-function(coords, imdims, voxdims=NULL, origin=NULL, 
                             linear.indices=TRUE, aperm=NULL,
                             Clamp=FALSE, CheckRanges=!Clamp, ...) {
-  checkmate::assertIntegerish(version, lower = 1L, upper = 7L)
   if(is.object(imdims)){
     if(!inherits(imdims, "im3d"))
       imdims=as.im3d(imdims)