Fix indentation of </span>

Change-Id: Ib7c40105c49c36238673bcd7effcfacab477579c
diff --git a/Changes b/Changes
index 72adc31..106043e 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,6 @@
         - -s option added that uses sentence boundaries provided by the KorAP tokenizer (-tk)
         - tokenizer invocation comments removed from KorAP XML output
+        - indentation of </span> tags fixed
 0.03 2021-01-12
         - Update KorAP-Tokenizer to released 2.0 version
         - Improve test suite for recent version
diff --git a/lib/KorAP/XML/TEI/Annotations/Annotation.pm b/lib/KorAP/XML/TEI/Annotations/Annotation.pm
index 03f583f..305de49 100644
--- a/lib/KorAP/XML/TEI/Annotations/Annotation.pm
+++ b/lib/KorAP/XML/TEI/Annotations/Annotation.pm
@@ -131,7 +131,7 @@
 
 # Serialize footer for lex and struct
 sub _footer {
-  return "      </fs>\n        </span>\n";
+  return "      </fs>\n    </span>\n";
 };