Updated versioning

setup.py

@@ -1,11 +1,23 @@
+import re
 from setuptools import setup
 
 with open('README.md', 'r') as f:
     long_description = f.read()
 
+# Read the version information from the verion file
+VERSION_FILE="tinkerforge_async/_version.py"
+VERSION_REGEX = r'^__version__ = [\'"]([^\'"]+)[\'"]$'
+with open(VERSION_FILE, 'r') as f:
+    version = f.read()
+    result = re.search(VERSION_REGEX, version, re.M)
+    if result:
+        version = result.group(1)
+    else:
+        raise RuntimeError('No version string found in file %s.', VERSION_FILE)
+
 setup(
    name='tinkerforge_async',
-   version='1.1.4',
+   version=version,
    author='Patrick Baus',
    author_email='[email protected]',
    url='https://github.com/PatrickBaus/TinkerforgeAsync',

tinkerforge_async/__init__.py

@@ -1 +1 @@
- 
+from _version import __version__