rm unused imports

src/models/state.ts

@@ -1,4 +1,4 @@
-import { Serie, Options, yAxisOrientation } from '../types';
+import { Serie, Options } from '../types';
 import { CoreSeries } from './series';
 import { CoreOptions } from './options';
 
@@ -6,9 +6,7 @@ import * as d3 from 'd3';
 
 import cloneDeep from 'lodash/cloneDeep';
 import min from 'lodash/min';
-import minBy from 'lodash/minBy';
 import max from 'lodash/max';
-import maxBy from 'lodash/maxBy';
 import sortBy from 'lodash/sortBy';
 import reverse from 'lodash/reverse';