chore: do not use default exports

BREAKING CHANGE: replace the default export by a named export

Author: stropitek

README.md

@@ -16,10 +16,10 @@ Confusion matrix for supervised classification. Compute metrics on your classifi
 
 ```js
 // CommonJS
-const ConfusionMatrix = require('ml-confusion-matrix');
+const { ConfusionMatrix } = require('ml-confusion-matrix');
 
 // ES6 module syntax
-import ConfusionMatrix from 'ml-confusion-matrix';
+import { ConfusionMatrix } from 'ml-confusion-matrix';
 ```
 
 ### Instanciate from the list of true and predicted labels

src/__tests__/fromLabels.test.ts

@@ -1,4 +1,4 @@
-import ConfusionMatrix from '..';
+import { ConfusionMatrix } from '..';
 
 describe('fromLabels', () => {
   it('identity', () => {

src/__tests__/metrics.test.ts

@@ -1,4 +1,4 @@
-import ConfusionMatrix from '..';
+import { ConfusionMatrix } from '..';
 
 // Tests are based on wikipedia page
 // https://en.wikipedia.org/wiki/Confusion_matrix

src/__tests__/test.test.ts

@@ -1,4 +1,4 @@
-import ConfusionMatrix from '..';
+import { ConfusionMatrix } from '..';
 
 let diagonal = {
   matrix: [

src/index.ts

@@ -6,7 +6,7 @@
  * @param matrix - The confusion matrix, a 2D Array. Rows represent the actual label and columns the predicted label.
  * @param labels - Labels of the confusion matrix, a 1D Array
  */
-export default class ConfusionMatrix {
+export class ConfusionMatrix {
   private labels: Label[];
   private matrix: number[][];
   constructor(matrix: number[][], labels: Label[]) {