thing: make release fix

Fix missing close parenthesis.
diff --git a/Makefile b/Makefile
index e1bba4d..828eaf8 100644
--- a/Makefile
+++ b/Makefile
@@ -88,7 +88,7 @@
 ifdef release
 	$$(sed -i '/version/ s/=.*/=$(KNOT_THING_LIB_VERSION)/g' ./$(KNOT_THING_NAME)/library.properties)
 	$$(sed -i '/version/ s/\([v\.]\)0\+\([[:digit:]]\+\)/\1\2/g' ./$(KNOT_THING_NAME)/library.properties)
-	$$(sed -i '/version/ s/KNOT-v//g' ./$(KNOT_THING_NAME)/library.properties
+	$$(sed -i '/version/ s/KNOT-v//g' ./$(KNOT_THING_NAME)/library.properties)
 endif
 
 	#Filling root and thing directory