set up Git LFS for large files

.github/prehooks/pre-commit

@@ -5,7 +5,7 @@ echo "Running pre-commit hook..."
 # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 echo ">>  Updating R documentation..."
 if command -v Rscript > /dev/null; then
-  if "$(Rscript -e 'cat(all(c('"'roxygen2'"', '"'pkgload'"') %in% rownames(installed.packages())))')" == "TRUE"; then
+  if [ "$(Rscript -e 'cat(all(c('"'roxygen2'"', '"'pkgload'"') %in% rownames(installed.packages())))')" = "TRUE" ]; then
     Rscript -e "suppressMessages(roxygen2::roxygenise())"
     currentpkg=`Rscript -e "cat(pkgload::pkg_name())"`
     git add man/*
@@ -59,6 +59,9 @@ git add DESCRIPTION
 
 # set version number to NEWS file
 if [ -e "NEWS.md" ]; then
+  if [ "$currentpkg" = "your" ]; then
+    currentpkg=""
+  fi
   sed -i -- "1s/.*/# ${currentpkg} ${currentversion}/" NEWS.md
   echo ">>  - updated NEWS.md"
   # remove leftover on macOS