Add newline at end of file (#2098)

diff --git a/source/reduce/reducer.cpp b/source/reduce/reducer.cpp
index 9835069..a751b71 100644
--- a/source/reduce/reducer.cpp
+++ b/source/reduce/reducer.cpp
@@ -143,4 +143,4 @@
 }
 
 }  // namespace reduce
-}  // namespace spvtools
\ No newline at end of file
+}  // namespace spvtools