fix: flutter create

Author: yulingtianxia

index.js

@@ -3,7 +3,7 @@ const main = require('./lib/main').main
 let dataPath = "test/objc/RuntimeStub.h"
 let option = {
     output: 'test/dart',
-    template: 'package',
+    template: 'plugin',
     projectName: 'testPlugin'
 }
 

lib/main.js

@@ -112,7 +112,11 @@ function formatDartFile(dartPath) {
 }
 
 function createFlutterPackage(template, projectName) {
-    var command = 'flutter create --platforms=android,ios --template=' + template + ' --project-name ' + projectName + ' ' + outputDir
+    var command = 'flutter create'
+    if (template == 'plugin') {
+        command += '--platforms=android,ios --template=' + template
+    }
+    command += ' --project-name ' + projectName + ' ' + outputDir
     execSync(command, { stdio: 'inherit' })
 }