更新.gitignore，停止追踪忽略文件

.hbuilderx/launch.json

@@ -1,18 +0,0 @@
-{
-    "version" : "1.0",
-    "configurations" : [
-        {
-            "app-plus" : {
-                "launchtype" : "local"
-            },
-            "default" : {
-                "launchtype" : "local"
-            },
-            "h5" : {
-                "launchtype" : "local"
-            },
-            "provider" : "aliyun",
-            "type" : "uniCloud"
-        }
-    ]
-}