[gi-docgen/wip/smcv/more-in-sdist] build: Add meson_options.txt to setuptools sdist

[Simon McVittie <smcv src gnome org>]

commit 5fcaba6f25ddf748c975b2e48012e458712f116d
Author: Simon McVittie <smcv debian org>
Date:   Thu Apr 15 16:38:13 2021 +0100

    build: Add meson_options.txt to setuptools sdist
    
    This was added by !60, so wasn't included in !59.
    
    Signed-off-by: Simon McVittie <smcv debian org>

 MANIFEST.in | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/MANIFEST.in b/MANIFEST.in
index dbc2445..9bd8ab3 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -16,5 +16,6 @@ include docs/*.py
 include docs/Makefile
 include examples/*.js
 include examples/*.toml
+include meson_options.txt
 recursive-include docs *.rst
 recursive-include gidocgen/templates *