Update list of dependencies required

`click` and `python-bugzilla` also need to be installed

Also add a `Pipfile` with these requirements added, since the
`README.md` recommends using `pipenv shell` and that is the preferred
dependency format over `requirements.txt`, and add `Pipfile.lock` and
`__pycache__` to `.gitignore`.

Signed-off-by: Michel Alexandre Salim <salimma@fedoraproject.org>

.gitignore

@@ -1 +1,3 @@
+Pipfile.lock
+__pycache__/
 *.log

Pipfile

@@ -0,0 +1,10 @@
+[[source]]
+url = "https://pypi.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+click = "*"
+fasjson-client = "*"
+python-bugzilla = "*"
+

README.md

@@ -26,7 +26,7 @@ Use the '--privacy' flag to not print emails in the log.
 
 To run the script you'll need:
 
-- fasjson_client to be installed
+- click, fasjson_client, and python-bugzilla to be installed
 - an active kerberos ticket to login to fasjson.fedoraproject.org
 - a bugzilla API key for bugzilla.redhat.com in your ~/.bugzillarc config file
 
@@ -38,7 +38,7 @@ open and manage an issue ticket for each detected inactive packager.
 ```
 $ pipenv shell
 ...
-$ pip install fasjson-client
+$ pipenv install
 ...
 $ sudo dnf install fedora-packager-kerberos
 ...