bump GeographicLib to v2.1

README.md

@@ -3,7 +3,7 @@
 [![Swift Version](https://img.shields.io/badge/swift-5.7-blue.svg)](https://swift.org)
 ![Platform](https://img.shields.io/badge/platform-macOS|linux--64-lightgray.svg)
 ![Build](https://github.com/dastrobu/geodesic/actions/workflows/ci.yaml/badge.svg)
-[![GeographicLib Version](https://img.shields.io/badge/GeographicLib-2.0-blue.svg)](https://github.com/geographiclib/geographiclib-c/releases/tag/v2.0)
+[![GeographicLib Version](https://img.shields.io/badge/GeographicLib-2.1-blue.svg)](https://github.com/geographiclib/geographiclib-c/releases/tag/v2.1)
 
 Solver for the inverse geodesic problem in Swift.
 
@@ -52,11 +52,10 @@ let package = Package(
 ## Implementation Details
 
 This Swift package is a wrapper for the
-[C library for Geodesics](https://geographiclib.sourceforge.io/html/C/). The author of this library is Charles Karney (
-[email protected]). The goal of this Swift package is to make some algorithms from
-[GeographicLib](https://github.com/geographiclib/geographiclib-c) available to the Swift world. Alternatively one can employ the
-package
-[vincenty](https://github.com/dastrobu/vincenty)
+[C implementation of the geodesic routines in GeographicLib](https://github.com/geographiclib/geographiclib-c).
+The goal of this Swift package is to make some algorithms from
+GeographicLib available to the Swift world. Alternatively one can employ the
+package [vincenty](https://github.com/dastrobu/vincenty)
 which is a much simpler solver for the inverse geodesic problem, completely written in Swift. Vincenty's formulae does,
 however, have some convergence problems in rare cases and may not give the same accuracy as Karney's algorithm.