Upgrade gradle 4.1

dai0304 · dai0304 · commit 55120cc0a340 · 2017-09-06T18:15:50.000+09:00
diff --git a/build.gradle b/build.gradle
@@ -134,5 +134,5 @@ subprojects {
 
 // ======== wrapper ========
 task wrapper(type: Wrapper) {
-	gradleVersion = "2.12"
+	gradleVersion = "4.1"
 }
