Highlight in docs there are CLI and GUI versions & add changelog

Author: dfandrich

doc/index.html

@@ -62,10 +62,13 @@ <h2>What is it?</h2>
 Most high-end DSLR and mirrorless cameras these days (as well as smartphones)
 have built-in GPS receivers that tag pictures automatically, but entry level
 models often do not. There are also cases where GPS signals are not available,
-such as inside some newer airplanes. In this latter case, the airplane's course
+such as inside some airplanes. In this latter case, the airplane's course
 can often be downloaded from web sites like FlightAware, converted to GPX
 format using gpsbabel, then correlated with pictures taken on board the plane
 with your camera.
+<p>
+GPS Correlate comes in two flavours: a graphical version for point-and-click
+convenience, or a command-line version for easy batch correlation.
 
 
 <h2>Documentation</h2>
@@ -75,6 +78,7 @@ <h2>Documentation</h2>
 <li><a href="gpscorrelate.html">Manual page of the command line client</a></li>
 <li><a href="gui.html">Usage of the GUI version</a></li>
 <li><a href="README.md">Readme file</a></li>
+<li><a href="https://github.com/dfandrich/gpscorrelate/blob/master/RELEASES">Changelog</a></li>
 </ul>
 
 <h2>Installation</h2>