AppVeyor CI: COMMA -> SPACE

Author: HenrikBengtsson

appveyor.yml

@@ -33,8 +33,8 @@ build_script:
   - Rscript -e "c(physical = parallel::detectCores(logical = FALSE), logical = parallel::detectCores())"
   - echo Current directory=%CD%
   - travis-tool.sh install_r digest
-  - travis-tool.sh install_r beepr, pbmcapply, plyr, progress
-  - travis-tool.sh install_r future, doFuture, future.apply, furrr
+  - travis-tool.sh install_r beepr pbmcapply plyr progress
+  - travis-tool.sh install_r future doFuture future.apply furrr
   - travis-tool.sh install_r shiny
   - travis-tool.sh install_github gaborcsardi/notifier@d92b1b6
 test_script: