change default import

Author: Adrinlol

README.md

@@ -20,7 +20,7 @@ npm install javascript-color-gradient
 Then import the module into your JavaScript:
 
 ```javascript
-import { Gradient } from "javascript-color-gradient";
+import Gradient from "javascript-color-gradient";
 ```
 
 ## Demo
@@ -43,7 +43,7 @@ import { Gradient } from "javascript-color-gradient";
 Using 2 colors and default (10) midpoints to generate an array of hex color values:
 
 ```javascript
-import { Gradient } from "javascript-color-gradient";
+import Gradient from "javascript-color-gradient";
 
 const gradientArray = new Gradient()
   .setColorGradient("#3F2CAF", "e9446a")
@@ -70,7 +70,7 @@ console.log(gradientArray);
 Using two colors and default (10) midpoints to return single hex color value corresponding to the provided index:
 
 ```javascript
-import { Gradient } from "javascript-color-gradient";
+import Gradient from "javascript-color-gradient";
 
 const colorAtIndexTwo = new Gradient()
   .setColorGradient("#3F2CAF", "e9446a")