Add "Update gitlab-git-http-server" section to 8.0-to-8.1 update guide

[ci skip]

doc/update/8.0-to-8.1.md

@@ -70,7 +70,15 @@ sudo -u git -H git fetch
 sudo -u git -H git checkout v2.6.5
 ```
 
-### 5. Install libs, migrations, etc.
+### 5. Update gitlab-git-http-server
+
+```bash
+cd /home/git/gitlab-git-http-server
+sudo -u git -H git checkout 0.3.0
+sudo -u git -H make
+```
+
+### 6. Install libs, migrations, etc.
 
 ```bash
 cd /home/git/gitlab
@@ -91,7 +99,7 @@ sudo -u git -H bundle exec rake assets:clean assets:precompile cache:clear RAILS
 sudo cp lib/support/init.d/gitlab /etc/init.d/gitlab
 ```
 
-### 6. Update configuration files
+### 7. Update configuration files
 
 #### New configuration options for `gitlab.yml`
 
@@ -101,12 +109,12 @@ There are new configuration options available for [`gitlab.yml`](config/gitlab.y
 git diff origin/8-0-stable:config/gitlab.yml.example origin/8-1-stable:config/gitlab.yml.example
 ```
 
-### 7. Start application
+### 8. Start application
 
     sudo service gitlab start
     sudo service nginx restart
 
-### 8. Check application status
+### 9. Check application status
 
 Check if GitLab and its environment are configured correctly: