Merge pull request #263 from lengyijun/patch-1

Update .gitignore
diff --git a/.gitignore b/.gitignore
index b0072b3..3eb1cf4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,6 +16,7 @@
 samplecode/**/*_u.h
 samplecode/**/*_t.c
 samplecode/**/*_t.h
+samplecode/**/bin/app
 
 **/target