docs version update

Author: SkalskiP

mkdocs.yml

@@ -15,7 +15,7 @@ copyright: Copyright © 2019 Piotr Skalski
 
 # Customization
 extra:
-  version: 1.7.0-alpha
+  version: 1.8.0-alpha
   social:
     - icon: fontawesome/brands/github
       link: https://github.com/SkalskiP