Change license from LGPL 2.1 to MIT

Fixes PHPOffice#140

Author: PowerKiKi

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 
 ## [Unreleased]
 
+### Changed
+
+- Change license from LGPL 2.1 to MIT [#140](https://github.com/PHPOffice/PhpSpreadsheet/issues/140)
+
 ### Added
 
 - Implementation of IFNA() logical function

LICENSE

@@ -1,345 +1,21 @@
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