Adopt tasks.json to new schema

.vscode/tasks.json

@@ -2,11 +2,12 @@
 	"version": "2.0.0",
 	"tasks": [
 		{
-			"customize": "vscode.npm.run watch",
-			"taskName": "Build VS Code",
+			"type": "npm",
+			"script": "watch",
+			"label": "Build VS Code",
 			"group": "build",
 			"isBackground": true,
-			"terminal": {
+			"presentation": {
 				"reveal": "never"
 			},
 			"problemMatcher": {
@@ -28,8 +29,9 @@
 			}
 		},
 		{
-			"customize": "gulp.tslint",
-			"taskName": "Run tslint",
+			"type": "gulp",
+			"task": "tslint",
+			"label": "Run tslint",
 			"problemMatcher": ["$tslint4"]
 		},
 		{
@@ -54,8 +56,9 @@
 			}
 		},
 		{
-			"customize": "gulp.electron",
-			"taskName": "Download electron"
+			"type": "gulp",
+			"task": "electron",
+			"label": "Download electron"
 		}
 	]
 }
\ No newline at end of file