Add [default] attribute

Author: laniakea64

syntax/just.vim

@@ -98,7 +98,7 @@ syn region justRecipeAttributes
    \ contains=justRecipeAttr,justRecipeAttrSep,justRecipeAttrArgs,justRecipeAttrArgError,justRecipeAttrValueShort
 
 syn keyword justRecipeAttr
-   \ confirm doc exit-message extension group linux macos metadata no-cd no-exit-message no-quiet openbsd parallel positional-arguments private script unix windows working-directory
+   \ confirm default doc exit-message extension group linux macos metadata no-cd no-exit-message no-quiet openbsd parallel positional-arguments private script unix windows working-directory
    \ contained
 syn match justRecipeAttrSep ',' contained
 syn match justRecipeAttrValueShort '\v:%(\_s|\\\n)*' transparent contained

tests/cases/recipes-with-extras.html

@@ -199,3 +199,7 @@
 <span class="Function">sleep2</span><span class="Operator">:</span>
 <span class="Number">&Tab;sleep 2</span>
 <span class="Number">&Tab;echo </span><span class="String">'sleep2 done'</span>
+
+<span class="Type">[default]</span>
+<span class="Function">the-default-recipe</span><span class="Operator">:</span>
+<span class="Number">&Tab;echo </span><span class="String">'default recipe'</span>

tests/cases/recipes-with-extras.just

@@ -199,3 +199,7 @@ sleep1:
 sleep2:
 	sleep 2
 	echo 'sleep2 done'
+
+[default]
+the-default-recipe:
+	echo 'default recipe'