Corrected spelling mistake in the naming of the license

README.md

@@ -51,7 +51,7 @@ If you are interested in participating in the development effort, subscribe to
 the [forum](https://forum.orekit.org/) and step up to discuss it. The larger
 the community is, the better Orekit will be. The main rule is that everything
 intended to be included in Orekit core must be distributed under the Apache
-License Version 2.0 (you will be asked to sign a contributor license
+License, version 2.0 (you will be asked to sign a contributor license
 agreement).
 
 More information is available in our
@@ -86,5 +86,5 @@ More detailed information is available in the
 ## License
 
 Orekit is licensed by [CS Systèmes d'Information](https://www.c-s.fr/) under
-the [Apache License Version 2.0](http://www.apache.org/licenses/LICENSE-2.0.html).
+the [Apache License, version 2.0](http://www.apache.org/licenses/LICENSE-2.0.html).
 A copy of this license is provided in the [LICENSE.txt](LICENSE.txt) file.