Update README

Let's forget about manually chosen colors

README.md

@@ -35,34 +35,6 @@ autocmd VimEnter * RainbowParentheses
 ```vim
 let g:rainbow#max_level = 16
 let g:rainbow#pairs = [['(', ')'], ['[', ']']]
-
-" By default, colors will be picked from the current color scheme
-" To override this behavior, define g:rainbow#colors as follows
-" (The colors in the example were taken from VimClojure)
-let g:rainbow#colors = {
-\   'dark': [
-\     ['yellow',  'orange1'     ],
-\     ['green',   'yellow1'     ],
-\     ['cyan',    'greenyellow' ],
-\     ['magenta', 'green1'      ],
-\     ['red',     'springgreen1'],
-\     ['yellow',  'cyan1'       ],
-\     ['green',   'slateblue1'  ],
-\     ['cyan',    'magenta1'    ],
-\     ['magenta', 'purple1'     ]
-\   ],
-\   'light': [
-\     ['darkyellow',  'orangered3'    ],
-\     ['darkgreen',   'orange2'       ],
-\     ['blue',        'yellow3'       ],
-\     ['darkmagenta', 'olivedrab4'    ],
-\     ['red',         'green4'        ],
-\     ['darkyellow',  'paleturquoise3'],
-\     ['darkgreen',   'deepskyblue4'  ],
-\     ['blue',        'darkslateblue' ],
-\     ['darkmagenta', 'darkviolet'    ]
-\   ]
-\ }
 ```
 
 [k]: https://github.com/kien/rainbow_parentheses.vim