Use correct version info for docs

The docs were using 0.1 as the project's version number. Read the correct
version from `wtforms_components/__init__.py` instead.

Author: jpvanhal

docs/conf.py

@@ -10,6 +10,16 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
+import pathlib
+import re
+
+
+def get_version():
+    path = pathlib.Path(__file__).parent.parent / "wtforms_components" / "__init__.py"
+    contents = path.read_text()
+    pattern = r'^__version__ = "(.*?)"$'
+    return re.search(pattern, contents, re.MULTILINE).group(1)
+
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
@@ -54,9 +64,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = "0.1"
+version = get_version()
 # The full version, including alpha/beta/rc tags.
-release = "0.1"
+release = version
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.