Trim filenames to fix double space after filename metadata

Change-Id: I578914ad892373e2ad09232d4f5dceb3bb75c740
diff --git a/t/data/goe.ud.conllu b/t/data/goe.ud.conllu
index 147071a..bfb4456 100644
--- a/t/data/goe.ud.conllu
+++ b/t/data/goe.ud.conllu
@@ -3,7 +3,7 @@
 # udpipe_model = german-hdt-ud-2.6-200830
 # udpipe_model_licence = CC BY-NC-SA
 # foundry = base
-# filename = GOE/AGA/00000/base/tokens.xml  
+# filename = GOE/AGA/00000/base/tokens.xml
 # text_id = GOE_AGA.00000
 # start_offsets = 0 0 9 12
 # end_offsets = 22 8 11 22