put the new packages in the YAML header where they belong

aastex62/aastex62_template.tex

@@ -12,11 +12,6 @@ $if(bibstyle)$
 \bibliographystyle{$bibstyle$}
 $endif$
 
-\usepackage{booktabs}
-\usepackage{listings}
-\newcommand{\passthrough}[1]{#1}
-\usepackage{framed}
-
 $if(texpackages)$
 $for(texpackages)$
 \usepackage

aastex62/demo.md

@@ -7,6 +7,9 @@ texpackages:
 #  opts:
 - name: amsmath
 #  opts:
+- name: booktabs
+- name: listings
+- name: framed
 bibstyle: aasjournal
 bibliography: demo.bib
 received: "\\today"

aastex62/macros.tex

@@ -1,2 +1,2 @@
 \newcommand\aastex{AAS\TeX}
-
+\newcommand{\passthrough}[1]{#1}