message: change suggestion
diff: @@ -192,8 +192,7 @@ build:
  @echo 'ERROR: Missing Stan submodules.'
  @echo 'Please run the following commands to fix:'
  @echo ''
  - @echo 'git submodule init'
  - @echo 'git submodule update --recursive'
  + @echo 'git submodule update --init --recursive'
  @echo ''
  @echo 'And try building again'
  @exit 1
  