update to latest gisconverter version

diff --git a/library/gisconverter b/library/gisconverter
index 84ceab55aa9984d0406ad6f196726a3f0a5f18cf..c6ec9a39195e9b1a58b9a4413a9a6fa090057ecb 160000 (submodule)
--- a/library/gisconverter
+++ b/library/gisconverter
@@ -1 +1 @@
-Subproject commit 84ceab55aa9984d0406ad6f196726a3f0a5f18cf
+Subproject commit c6ec9a39195e9b1a58b9a4413a9a6fa090057ecb