Fix bug.

personal_project.gemspec

@@ -2,6 +2,8 @@ $:.push File.expand_path("../lib", __FILE__)
 
 # Maintain your gem's version:
 require "personal_project/version"
+bundle_update_flag = ARGV[0]=='update' || ARGV[0]=='install'
+if bundle_update_flag
     app_path = File.expand_path(__dir__)
     template_path = ENV['PWD'] + '/app/templates'
     all_template = Dir.glob(template_path+'/*/')
@@ -15,6 +17,7 @@ all_template.each do |folder|
             end
         end
     end
+end
 # Describe your gem and declare its dependencies:
 Gem::Specification.new do |s|
   s.name        = "personal_project"