Update .gitignore for Gradle
diff --git a/.gitignore b/.gitignore
index fa7042b..7ae3d1d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,10 @@
 # Maven
 target
 
+# Gradle
+build
+.gradle
+
 # IntelliJ IDEA
 .idea
 *.iml