Attempt to fix readthedocs build

Author: adamreeve

docs/conf.py

@@ -12,6 +12,7 @@
 # serve to show the default.
 
 import sys, os
+import configparser
 
 # 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
@@ -50,13 +51,12 @@
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
-v_globals = {}
-v_locals = {}
-exec(open('../nptdms/version.py').read(), v_globals, v_locals)
+setup_cfg = configparser.ConfigParser()
+setup_cfg.read('../setup.cfg')
 # The short X.Y version.
-version = '.'.join('%d' % d for d in v_locals['__version_info__'][:2])
+version = '.'.join(setup_cfg['metadata']['version'].split('.')[:2])
 # The full version, including alpha/beta/rc tags.
-release = v_locals['__version__']
+release = setup_cfg['metadata']['version']
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.