Actualize copyrights

about.html

@@ -43,6 +43,8 @@
 <a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/deed.en_US">
 <img alt="Creative Commons License" style="border-width:0"
 src="https://i.creativecommons.org/l/by-sa/3.0/80x15.png" /></a><br />
-Copyright © 2006-2018 Ricardo Garcia Gonzalez</div>
+Copyright © 2006-2011 Ricardo Garcia Gonzalez<br />
+Copyright © 2011-2018 youtube-dl developers
+</div>
 </body>
 </html>

donations.html

@@ -36,6 +36,8 @@
 <a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/deed.en_US">
 <img alt="Creative Commons License" style="border-width:0"
 src="https://i.creativecommons.org/l/by-sa/3.0/80x15.png" /></a><br />
-Copyright © 2006-2018 Ricardo Garcia Gonzalez</div>
+Copyright © 2006-2011 Ricardo Garcia Gonzalez<br />
+Copyright © 2011-2018 youtube-dl developers
+</div>
 </body>
 </html>

download.html.in

@@ -70,6 +70,8 @@ See the <a href="https://pypi.python.org/pypi/youtube_dl">pypi page</a> for more
 <a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/deed.en_US">
 <img alt="Creative Commons License" style="border-width:0"
 src="https://i.creativecommons.org/l/by-sa/3.0/80x15.png" /></a><br />
-Copyright © 2006-2018 Ricardo Garcia Gonzalez</div>
+Copyright © 2006-2011 Ricardo Garcia Gonzalez<br />
+Copyright © 2011-2018 youtube-dl developers
+</div>
 </body>
 </html>

index.html

@@ -32,6 +32,8 @@
 <a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/deed.en_US">
 <img alt="Creative Commons License" style="border-width:0"
 src="https://i.creativecommons.org/l/by-sa/3.0/80x15.png" /></a><br />
-Copyright © 2006-2018 Ricardo Garcia Gonzalez</div>
+Copyright © 2006-2011 Ricardo Garcia Gonzalez<br />
+Copyright © 2011-2018 youtube-dl developers
+</div>
 </body>
 </html>

supportedsites.html.in

@@ -21,6 +21,8 @@
 <a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/deed.en_US">
 <img alt="Creative Commons License" style="border-width:0"
 src="https://i.creativecommons.org/l/by-sa/3.0/80x15.png" /></a><br />
-Copyright © 2006-2018 Ricardo Garcia Gonzalez</div>
+Copyright © 2006-2011 Ricardo Garcia Gonzalez<br />
+Copyright © 2011-2018 youtube-dl developers
+</div>
 </body>
 </html>