Update install.rst
Update install.rst

Postgres 9.5 is also supported.
mastizada/pontoon,jotes/pontoon,jotes/pontoon,mathjazz/pontoon,jotes/pontoon,participedia/pontoon,mozilla/pontoon,mastizada/pontoon,participedia/pontoon,mathjazz/pontoon,jotes/pontoon,mozilla/pontoon,participedia/pontoon,mathjazz/pontoon,mozilla/pontoon,mastizada/pontoon,mathjazz/pontoon,participedia/pontoon,mathjazz/pontoon,mozilla/pontoon,mozilla/pontoon,mastizada/pontoon