Log Message:
(math/R-gstat) Updated 2.0.2 to 2.0.7

# version 2.0-7
* return `NA` as estimate when prediction/simulation fails; #80

# version 2.0-6
* fixes `object 'ret' not found` bug introduced by #63; #65 #66 #70

# version 2.0-5
* use multiple cores in `variogramST`, using pkg future; #63 by
  @sigmafelix
* fix bug with conditional simulation using `stars` target grid and
  nsim=1, #58

# version 2.0-4
* fix CRAN warning issue

# version 2.0-3
* fix bug in support for `sf` objects; #46
* fix `krigeTg` for the case when data or newdata are of class `sf` or
  `sfc`; #51