Hello, install the plug-in bestest_markdown_editor to report errors

[peixiaoqing]

redmine：4.0.0
ruby： 2.3.8

Hello, installation plug-in bestest_markdown_editor error reporting, lack of modules, how to install this module, I used “gem install alias_method_chain ”，But it's still a mistake.

detailed information：
implement：rake redmine:plugins:migrate NAME=bestest_markdown_editor RAILS_ENV=production
rake aborted!

bash-4.2# rake redmine:plugins:migrate NAME=bestest_markdown_editor RAILS_ENV=production
rake aborted!
NoMethodError: undefined method alias_method_chain' for ApplicationHelper:Module Did you mean? alias_method /radmin/apps/redmine/htdocs/plugins/bestest_markdown_editor/lib/bestest_markdown_editor/patches/application_helper_patch.rb:10:in block in included'
/radmin/apps/redmine/htdocs/plugins/bestest_markdown_editor/lib/bestest_markdown_editor/patches/application_helper_patch.rb:8:in class_eval' /radmin/apps/redmine/htdocs/plugins/bestest_markdown_editor/lib/bestest_markdown_editor/patches/application_helper_patch.rb:8:in included'
/radmin/apps/redmine/htdocs/plugins/bestest_markdown_editor/lib/bestest_markdown_editor/patches/application_helper_patch.rb:34:in include' /radmin/apps/redmine/htdocs/plugins/bestest_markdown_editor/lib/bestest_markdown_editor/patches/application_helper_patch.rb:34:in <top (required)>'
/radmin/apps/redmine/htdocs/plugins/bestest_markdown_editor/init.rb:1:in <top (required)>' /radmin/apps/redmine/htdocs/lib/redmine/plugin.rb:173:in block in load'
/radmin/apps/redmine/htdocs/lib/redmine/plugin.rb:164:in each' /radmin/apps/redmine/htdocs/lib/redmine/plugin.rb:164:in load'
/radmin/apps/redmine/htdocs/config/initializers/30-redmine.rb:21:in <top (required)>' /radmin/apps/redmine/htdocs/config/environment.rb:14:in <top (required)>'
Tasks: TOP => redmine:plugins:migrate => environment
(See full trace by running task with --trace)

[paulvi]

Redmine default plugins folder is redmine/plugins

README recommended way is to clone into that folder

新年快乐！Happy Chinese New Year!