Fixed label color issue and added Import/Export versioning table

doc/user/project/settings/import_export.md

@@ -3,8 +3,8 @@
 >**Notes:**
 >
 >  - [Introduced][ce-3050] in GitLab 8.9.
->  - Importing will not be possible if the import instance version is lower
->    than that of the exporter.
+>  - Importing will not be possible if the import instance version differs from
+>    that of the exporter.
 >  - For existing installations, the project import option has to be enabled in
 >    application settings (`/admin/application_settings`) under 'Import sources'.
 >    You will have to be an administrator to enable and use the import functionality.
@@ -17,6 +17,20 @@
 Existing projects running on any GitLab instance or GitLab.com can be exported
 with all their related data and be moved into a new GitLab instance.
+## Version history
+
+| GitLab version | Import/Export version |
+| -------- | -------- |
+| 8.12.0 to current  | 0.1.4    |
+| 8.10.3   | 0.1.3    |
+| 8.10.0   | 0.1.2    |
+| 8.9.5    | 0.1.1    |
+| 8.9.0    | 0.1.0    |
+ 
+ > The table reflects what GitLab version we updated the Import/Export version at.
+ > For instance, 8.10.3 and 8.11 will have the same Import/Export version (0.1.3)
+ > and the exports between them will be compatible.
+
 ## Exported contents
 The following items will be exported:

lib/gitlab/import_export.rb

@@ -2,6 +2,7 @@ module Gitlab
   module ImportExport
     extend self
+    # For every version update, the version history in import_export.md has to be kept up to date.
     VERSION = '0.1.4'
     FILENAME_LIMIT = 50

lib/gitlab/import_export/relation_factory.rb

@@ -19,7 +19,7 @@ module Gitlab
       EXISTING_OBJECT_CHECK = %i[milestone milestones label labels].freeze
-      FINDER_ATTRIBUTES = %w[title color project_id].freeze
+      FINDER_ATTRIBUTES = %w[title project_id].freeze
       def self.create(*args)
         new(*args).create