new installation process

lib/self-upgrade.bash

@@ -7,7 +7,6 @@
 function self_upgrade {
   local backup="$MIAOU_BASH_DIR".before_upgrade
   sudo mv "$MIAOU_BASH_DIR" "$backup"
-  # TODO: install2
   if "$backup"/install.sh upgraded; then
     sudo rm -rf "$backup"
     echo -n "version: "
@@ -25,10 +24,9 @@ source "$MIAOU_BASH_DIR"/lib/functions.bash
 sudo_root
 assert_system_mode
 
-current=$("$MIAOU_BASH_DIR"/bin/miaou-bash --version)
+current=$(miaou-bash --version)
 latest=$("$MIAOU_BASH_DIR"/tools/wget_semver artcode miaou/miaou-bash)
 if [[ "$current" == "$latest" ]]; then
-  . "$MIAOU_BASH_DIR"/lib/initiate.bash
   echo "up-to-date version: $current"
 else
   self_upgrade