Use main package version in docs

docs/conf.py

@@ -18,6 +18,8 @@
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 sys.path.insert(0, os.path.abspath(".."))
 
+from metsrw import __version__
+
 # -- General configuration ------------------------------------------------
 
 # If your documentation needs a minimal Sphinx version, state it here.
@@ -49,9 +51,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = "0.3.15"
+version = __version__
 # The full version, including alpha/beta/rc tags.
-release = "0.3.15"
+release = version
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.