Chore: Travis CI: Remove Node 9, add 10 and 12, don't reinstall npm
Chore: Travis CI: Remove Node 9, add 10 and 12, don't reinstall npm

styleguidist/react-styleguidist,sapegin/react-styleguidist,styleguidist/react-styleguidist,sapegin/react-styleguidist,styleguidist/react-styleguidist