change future theme option color

src/client/js/components/Admin/Customize/CustomizeThemeOptions.jsx

@@ -35,7 +35,7 @@ class CustomizeThemeOptions extends React.Component {
     }, {
       name: 'spring',     bg: '#fff5ee', topbar: '#d3687c', sidebar: '#ff69b4', theme: '#ffb6c1',
     }, {
-      name: 'future',     bg: '#16282D', topbar: '#2a2929', sidebar: '#052e2f', theme: '#04B4AE',
+      name: 'future',     bg: '#16282d', topbar: '#2a2929', sidebar: '#00b5b7', theme: '#00b5b7',
     }, {
       name: 'halloween',  bg: '#030003', topbar: '#aa4a04', sidebar: '#162b33', theme: '#e9af2b',
     }];