[core] Moved __version__ string to its own package.

It reduces the duplication of `__version__`, which before was defined
on:

- `setup.py`
- `setup.cfg`
- `platypush/__init__.py`

platypush/__init__.py

@@ -16,6 +16,7 @@ from .message.response import Response
 from .procedure import procedure
 from .runner import main
 from .utils import run
+from .__version__ import __version__
 
 # Alias for platypush.event.hook.hook,
 # see https://git.platypush.tech/platypush/platypush/issues/399
@@ -23,7 +24,6 @@ when = hook
 
 
 __author__ = 'Fabio Manganiello <fabio@manganiello.tech>'
-__version__ = '1.1.3'
 __all__ = [
     'Application',
     'Variable',
@@ -41,6 +41,7 @@ __all__ = [
     'procedure',
     'run',
     'when',
+    '__version__',
 ]
 
 

platypush/__version__.py

@@ -0,0 +1 @@
+__version__ = '1.1.3'

setup.cfg

@@ -12,6 +12,8 @@ data_files =
 	platypush/config/*.yaml
 
 [metadata]
+name = platypush
+version = attr: platypush.__version__.__version__
 description_file = README.md
 
 [flake8]

setup.py

@@ -66,7 +66,6 @@ backend = pkg_files('platypush/backend')
 
 setup(
     name="platypush",
-    version="1.1.3",
     author="Fabio Manganiello",
     author_email="fabio@manganiello.tech",
     description="Platypush service",