Tab Readme at Repository not showing

[pesseba]

I activated the plugin but Readme is not showing the Tab "Readme ad Repository" in modules options, as the image:

There is some trick to solve this?

Follow my environment info

Environment:
  Redmine version                3.4.6.stable
  Ruby version                   2.3.3-p222 (2016-11-21) [i386-mingw32]
  Rails version                  4.2.8
  Environment                    production
  Database adapter               Mysql2
SCM:
  Subversion                     1.12.2
  Mercurial                      5.1
  Git                            2.19.1
  Filesystem                     
Redmine plugins:
  clipboard_image_paste          1.13
  readme_at_repositories         0.3.0
  redmine_agile                  1.4.12
  redmine_checklists             3.1.16
  redmine_ckeditor               1.1.7
  redmine_cms                    1.2.1
  redmine_contacts               4.2.5
  redmine_custom_css             0.1.7
  redmine_knowledgebase          3.3.1