patch 8.2.2593: list of distributed files is incomplete

Problem:    List of distributed files is incomplete.
Solution:   Add a file and rename another.
diff --git a/Filelist b/Filelist
index 04a4332..82fb376 100644
--- a/Filelist
+++ b/Filelist
@@ -13,7 +13,8 @@
 		.hgignore \
 		.lgtm.yml \
 		.travis.yml \
-		appveyor.yml \
+		.appveyor.yml \
+		.codecov.yml \
 		ci/appveyor.bat \
 		ci/build-snd-dummy.sh \
 		ci/config.mk*.sed \