added optional arg for updating minimum rust version

documentation/bump_versions.sh

@@ -4,6 +4,9 @@
 #
 # e.g if the upcoming platform release was v1.1.29 and the release version 1.2.9 you'd run this as:
 # `./bump_versions.sh "1.1.29" "1.2.9"`
+#
+# you can also set the minumum rust version by passing an optional 3rd argument:
+# `./bump_versions.sh "1.1.29" "1.2.9" "1.67"`
 
 # array of project dirs
 declare -a projects=("docs" "dev-portal" "operators")
@@ -12,6 +15,12 @@ declare -a projects=("docs" "dev-portal" "operators")
 for i in "${projects[@]}"
 do
   # sed the vars in the book.toml file for each project
+  echo "setting platform and wallet versions in $i"
   sed -i 's/platform_release_version =.*/platform_release_version = "'$1'"/' "$i"/book.toml
   sed -i 's/wallet_release_version =.*/wallet_release_version = "'$2'"/' "$i"/book.toml
+  if [ "$3" ]
+  then
+    echo "setting minimum rust version in $i"
+    sed -i 's/minimum_rust_version = .*/minimum_rust_version = "'$3'"/' "$i"/book.toml
+  fi
 done