Update README.md

Change license shield.

README.md

@@ -2,7 +2,7 @@
 [![Open Source Love svg2](https://badges.frapsoft.com/os/v2/open-source.svg?v=103)](https://github.com/pro-well-plan/pwptemp/blob/master/LICENSE.md)
 [![PyPI version](https://badge.fury.io/py/welleng.svg)](https://badge.fury.io/py/welleng)
 [![Downloads](https://static.pepy.tech/personalized-badge/welleng?period=total&units=international_system&left_color=grey&right_color=orange&left_text=Downloads)](https://pepy.tech/project/welleng)
-[![License: LGPL v3](https://img.shields.io/badge/License-LGPL_v3-blue.svg)](https://www.gnu.org/licenses/lgpl-3.0)
+[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 
 [welleng] aspires to be a collection of useful tools for Wells/Drilling Engineers, kicking off with a range of well trajectory analysis tools.