Add readthedocs config yaml and use version in conf.py

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

docs/conf.py

@@ -21,6 +21,8 @@ import os
 sys.path.insert(0, os.path.abspath('.'))
 sys.path.insert(0, os.path.abspath('..'))
 
+import aqt.version
+
 # -- General configuration ------------------------------------------------
 
 # If your documentation needs a minimal Sphinx version, state it here.
@@ -60,10 +62,10 @@ author = u'Hiroshi Miura'
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
-# The short X.Y version.
-version = u'1.0'
 # The full version, including alpha/beta/rc tags.
-release = u'1.0.0b2'
+release = aqt.version.__version__
+# The short X.Y version.
+version = '.'.join(release.split('.')[:2])
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.