build-release: Fix build failing due to missing .coveralls.yml

.coveralls.yml has been superceded by codecov.yml. Update the release
build script to delete the new file.

(cherry picked from commit ecb996f0)

bin/build-release.sh

@@ -58,11 +58,11 @@ cp -rv "$TARGET/metadata-templates/"* "$TARGET/metadata/"
 rm -rf "$TARGET/.git"
 rm -rf "$TARGET/node_modules"
 rm "$TARGET/www/assets/js/stylesheet.js"*
-rm "$TARGET/.coveralls.yml"
 rm "$TARGET/.editorconfig"
 rm "$TARGET/.gitattributes"
 rm "$TARGET/.php_cs.dist"
 rm "$TARGET/.travis.yml"
+rm "$TARGET/codecov.yml"
 rm "$TARGET/psalm.xml"
 rm "$TARGET"/{,modules}/.gitignore
 rm "$TARGET"/{cache,config,metadata,locales}/.gitkeep