conf.py: bump docs version to open up development

With the 0.1.0 release done we are now back in development mode.
Indicate this by setting the version to 0.1.99. If we ned to provide
stable update releases to 0.1.0 they will come from a release branch as
0.1.1 .. 0.1.n.

Signed-off-by: Stefan Schmidt <stefan.schmidt@huawei.com>

conf.py

@@ -25,7 +25,7 @@ project = 'OpenHarmony'
 copyright = '2021'
 author = 'OSTC'
 
-version = '0.1.0'
+version = '0.1.99'
 release = version
 
 # -- General configuration ---------------------------------------------------