Removing old update docs

docs/update/update_0.2.x-0.3.x.md

-# Upgrade Notes
-
-This documentation outlines steps for you to upgrade from gitlab-mirrors `0.2.x` to gitlab-mirrors `0.3.x`.  It is assumed you'll be working on a test instance of gitlab in a production environment.  If you only have a single gitlab instance then follow these steps with care and at your own risk.
-
-gitlab-mirrors has been certified to use a new prerequisite library called [pyapi-gitlab](https://github.com/Itxaka/pyapi-gitlab) (formerly called python-gitlab).  Therefore you must install `pyapi-gitlab` before upgrading `gitlab-mirrors` to the latest edition.
-
-# 1. Disable any cron jobs
-
-If you have cron jobs set up then you'll need to disable them to avoid them launching gitlab-mirrors during your upgrade.
-
-# 2. Update python-gitlab to pyapi-gitlab
-
-I'll ouline the steps here real quick.
-
-    cd /usr/local/src
-    git checkout https://github.com/Itxaka/pyapi-gitlab.git
-    git checkout 4d778d780161869550d8e514cdc50df2398f844e
-    python setup.py install
-
-You must remove the previous conflicting library from `/usr/local/lib/python2.7/dist-packages/python_gitlab-0.1-py2.7.egg` by default on my system.  Your system may vary the location.  If you're not sure where it's at then you can locate it using `mlocate` package in RHEL.
-
-    yum install mlocate
-    updatedb
-    locate *.egg
-    rm -rf /usr/local/lib/python2.7/dist-packages/python_gitlab-0.1-py2.7.egg
-
-# 3. Update your gitlab-mirrors
-
-    su - gitmirror
-    cd gitlab-mirrors
-    git checkout master
-    git fetch
-    git pull origin master
-    git checkout v0.3.0
-
-Test on a dummy project to ensure your new setup works.  Once you have verified everything works then you can re-enable the cron jobs.