[recipes] help: Add one missing author (follow-up to previous 4eb2571)

[Andre Klapper <aklapper src gnome org>]

commit 33420baa1ab94537eb28ab7d743b99b6e3b93e2c
Author: Andre Klapper <a9016009 gmx de>
Date:   Thu May 21 21:36:03 2020 +0200

    help: Add one missing author (follow-up to previous 4eb2571)
    
    See #77 for context; see f8d708e0 for authorship.

 help/C/find-recipe.page | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/help/C/find-recipe.page b/help/C/find-recipe.page
index e40a28e..b2b88c4 100644
--- a/help/C/find-recipe.page
+++ b/help/C/find-recipe.page
@@ -12,6 +12,11 @@
       <email its:translate="no">pcutler gnome org</email>
       <years>2017</years>
     </credit>
+    <credit type="author">
+      <name its:translate="no">Matthias Clasen</name>
+      <email its:translate="no">mclasen redhat com</email>
+      <years>2017</years>
+    </credit>
     <include href="legal.xml" xmlns="http://www.w3.org/2001/XInclude"/>
   </info>