tests/data/README.md: Add a blank line

Add a blank line before the code span (three backticks).
wantehchang · May 25, 2023 · 0008c77 · 0008c77
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commit 0008c77
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/tests/data/README.md b/tests/data/README.md
@@ -206,6 +206,7 @@ This is allowed per the specification. libavif should decode such files
 correctly (i.e.) it should report them as files with alpha channel.
 
 Box structure of the items in this file:
+
 ```
 [primary item grid]
    ^       ^