Add Python 3.6 and 3.7 to PyPI page
Add Python 3.6 and 3.7 to PyPI page

Should modify the bottom left of https://pypi.org/project/bottle on the next [release](https://github.com/bottlepy/bottle/releases).
bottlepy/bottle,ifduyue/bottle,defnull/bottle,defnull/bottle,ifduyue/bottle,oz123/bottle,oz123/bottle,bottlepy/bottle,fkazimierczak/bottle,fkazimierczak/bottle