Remove unnused method

src/LineChart/LineChart.js

@@ -67,27 +67,6 @@ class LineChart extends Component {
     }));
     return [lower, upper];
   }
-
-  /**
-   * Add default values for the abscissa axis, if there is none
-   * @param {Object(Array(Object))} data the data to be plotted
-   */
-  pre_process(data) {
-    let new_data = {}
-    // Iterate over the plot names (keys in data)
-    Object.keys(data).forEach((name) => {
-      // Iterate over the data of the plot (entries in the Array)
-      new_data[name] = data[name].map((entry, i) => {
-        // `entry` is an object supposed to have two keys: `x` and `y`. If the latter is missing, we add one based
-        // on the index of `entry` in the array.
-        if (!('x' in entry)) {
-          entry.x = i;
-        }
-        return entry;
-      })
-    });
-    return new_data
-  }
   
   render() {
     // Use the margin convention practice 
@@ -98,7 +77,6 @@ class LineChart extends Component {
     const viewbox = "0 0 " + (width + margin.left + margin.right) +" "+ (height + margin.top + margin.bottom);
     
     const data = this.props.data;
-    // const data = this.pre_process(this.props.data);
     
     // Allocate one colour per line to plot
     const lineNames = Object.keys(data);