Bump import/export version to 2.2.0

We need to bump import/export version because we introduced a new
object's hierarchy that is not backwards compatible.

doc/user/project/settings/import_export.md

@@ -30,7 +30,8 @@ with all their related data and be moved into a new GitLab instance.
 
 | GitLab version   | Import/Export version |
 | ---------------- | --------------------- |
-| 10.3 to current  | 0.2.1                 |
+| 10.4 to current  | 0.2.2                 |
+| 10.3             | 0.2.1                 |
 | 10.0             | 0.2.0                 |
 | 9.4.0            | 0.1.8                 |
 | 9.2.0            | 0.1.7                 |

lib/gitlab/import_export.rb

@@ -3,7 +3,7 @@ module Gitlab
     extend self
 
     # For every version update, the version history in import_export.md has to be kept up to date.
-    VERSION = '0.2.1'.freeze
+    VERSION = '0.2.2'.freeze
     FILENAME_LIMIT = 50
 
     def export_path(relative_path:)