Lint: Update additional requirement for gitlint.

Author: LoopThrough-i-j

README.md

@@ -25,14 +25,18 @@ and [commit guidelines](https://zulip.readthedocs.io/en/latest/contributing/vers
 1. Fork and clone the Git repo:
    `git clone https://github.com/<your_username>/python-zulip-api.git`
 
-2. Make sure you have [pip](https://pip.pypa.io/en/stable/installing/)
+2. Setup upstream and fetch upstream/master (Required for Gitlint):
+   - `git remote add upstream https://github.com/zulip/python-zulip-api.git`
+   - `git fetch upstream master`
+
+3. Make sure you have [pip](https://pip.pypa.io/en/stable/installing/)
    and [virtualenv](https://virtualenv.pypa.io/en/stable/installation.html)
    installed.
 
-3. `cd` into the repository cloned earlier:
+4. `cd` into the repository cloned earlier:
    `cd python-zulip-api`
 
-4. Run:
+5. Run:
    ```
    python3 ./tools/provision
    ```
@@ -43,14 +47,14 @@ and [commit guidelines](https://zulip.readthedocs.io/en/latest/contributing/vers
    python3 ./tools/provision -p <path_to_your_python_version>
    ```
 
-5. If that succeeds, it will end with printing the following command:
+6. If that succeeds, it will end with printing the following command:
    ```
    source /.../python-zulip-api/.../activate
    ```
    You can run this command to enter the virtual environment.
    You'll want to run this in each new shell before running commands from `python-zulip-api`.
 
-6. Once you've entered the virtualenv, you should see something like this on the terminal:
+7. Once you've entered the virtualenv, you should see something like this on the terminal:
    ```
    (zulip-api-py3-venv) user@pc ~/python-zulip-api $
    ```