add .checkstyle to .gitignore

8959c4f3 · Noel Grandin · 0a92f254 · 8959c4f3
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,4 @@
 /test.out.txt
 .DS_Store
 /.idea/
+.checkstyle
\ No newline at end of file