fix: make sure pip install from github works

pip install from github was failing with the following error:

```
× python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [8 lines of output]
      Traceback (most recent call last):
        File "<string>", line 2, in <module>
        File "<pip-setuptools-caller>", line 34, in <module>
        File "/private/var/folders/8l/klypdyl51dvb7_1kztfgsv8m0000gn/T/pip-req-build-vx02zbxx/setup.py", line 20, in <module>
          from ansibleplaybookgrapher import __version__, __prog__
        File "/private/var/folders/8l/klypdyl51dvb7_1kztfgsv8m0000gn/T/pip-req-build-vx02zbxx/ansibleplaybookgrapher/__init__.py", line 18, in <module>
          from ansible.utils.display import Display
      ModuleNotFoundError: No module named 'ansible'
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.
```

ansibleplaybookgrapher/__init__.py

@@ -27,8 +27,6 @@
 from .graph_model import PlaybookNode, PlayNode, TaskNode, RoleNode, BlockNode
 from .parser import PlaybookParser
 
-__version__ = "2.1.2"
-__prog__ = "ansible-playbook-grapher"
 
 display = Display()
 

ansibleplaybookgrapher/cli.py

@@ -23,7 +23,8 @@
 from ansible.release import __version__ as ansible_version
 from ansible.utils.display import Display
 
-from ansibleplaybookgrapher import __prog__, __version__, Grapher
+from ansibleplaybookgrapher import Grapher
+from ansibleplaybookgrapher.version import __prog__, __version__
 from ansibleplaybookgrapher.renderer import OPEN_PROTOCOL_HANDLERS
 from ansibleplaybookgrapher.renderer.graphviz import GraphvizRenderer
 from ansibleplaybookgrapher.renderer.mermaid import (

ansibleplaybookgrapher/version.py

@@ -0,0 +1,2 @@
+__version__ = "2.2.0-dev"
+__prog__ = "ansible-playbook-grapher"

setup.py

@@ -17,7 +17,7 @@
 
 from setuptools import setup, find_packages
 
-from ansibleplaybookgrapher import __version__, __prog__
+from ansibleplaybookgrapher.version import __version__, __prog__
 
 
 def read_requirements(path):

tests/conftest.py

@@ -3,7 +3,7 @@
 import pytest
 from ansible.plugins.loader import init_plugin_loader
 
-from ansibleplaybookgrapher import __prog__
+from ansibleplaybookgrapher.version import __prog__
 from ansibleplaybookgrapher.cli import PlaybookGrapherCLI
 from tests import INVENTORY_FILE, FIXTURES_DIR
 

tests/test_cli.py

@@ -2,7 +2,7 @@
 from ansible.errors import AnsibleOptionsError
 from ansible.release import __version__ as ansible_version
 
-from ansibleplaybookgrapher import __prog__, __version__
+from ansibleplaybookgrapher.version import __prog__, __version__
 from ansibleplaybookgrapher.cli import PlaybookGrapherCLI
 
 

tests/test_graphviz_renderer.py

@@ -6,7 +6,7 @@
 import pytest
 from pyquery import PyQuery
 
-from ansibleplaybookgrapher import __prog__
+from ansibleplaybookgrapher.version import __prog__
 from ansibleplaybookgrapher.cli import PlaybookGrapherCLI
 from tests import FIXTURES_DIR
 

tests/test_mermaid_renderer.py

@@ -3,7 +3,7 @@
 
 import pytest
 
-from ansibleplaybookgrapher import __prog__
+from ansibleplaybookgrapher.version import __prog__
 from ansibleplaybookgrapher.cli import PlaybookGrapherCLI
 from tests import FIXTURES_DIR