Update rc_awesome.xsh

xontrib/rc_awesome.xsh

@@ -196,6 +196,7 @@ if $XONSH_INTERACTIVE:
     # Read more: https://github.com/anki-code/xonsh-cheatsheet/blob/main/README.md#install-xonsh-with-package-and-environment-management-system
     #
     _xontribs_to_load = (
+        'spec_mod',           # Library of xonsh subprocess specification modifiers e.g. `$(@json echo '{}')`.
         'jump_to_dir',        # Jump to used before directory by part of the path. Lightweight zero-dependency implementation of autojump or zoxide projects functionality. 
         'prompt_bar',         # The bar prompt for xonsh shell with customizable sections. URL: https://github.com/anki-code/xontrib-prompt-bar
         'whole_word_jumping', # Jumping across whole words (non-whitespace) with Ctrl+Left/Right and Alt+Left/Right on Linux or Option+Left/Right on macOS.