Updated links and mailing list addresses.

README.md

@@ -4,7 +4,7 @@ About
 wxWidgets is a free and open source cross-platform C++ framework
 for writing advanced GUI applications using native controls.
 
-![wxWidgets Logo](http://www.wxwidgets.org/assets/img/header-logo.png)
+![wxWidgets Logo](https://www.wxwidgets.org/assets/img/header-logo.png)
 
 
 wxWidgets allows you to write native-looking GUI applications for
@@ -13,7 +13,7 @@ the differences in the non-GUI aspects between them. It is free
 for the use in both open source and commercial applications, comes
 with the full, easy to read and modify, source and extensive
 documentation and a collection of more than a hundred examples.
-You can learn more about wxWidgets at http://www.wxwidgets.org/
+You can learn more about wxWidgets at https://www.wxwidgets.org/
 and read its documentation online at http://docs.wxwidgets.org/
 
 
@@ -48,10 +48,11 @@ Further information
 
 If you are looking for support, you can get it from
 
-- wx-users [mailing list](http://www.wxwidgets.org/support/mailing-lists/)
-- wxForum at http://forums.wxwidgets.org/
-- #wxwidgets IRC channel
-- http://stackoverflow.com/ if you tag your question with "wxwidgets"
+- [Mailing Lists](https://www.wxwidgets.org/support/mailing-lists/)
+- [Discussion Forums][https://forums.wxwidgets.org/]
+- [#wxwidgets IRC channel][https://www.wxwidgets.org/support/irc/]
+- Stack Overflow (tag your questions with @c wxwidgets):
+  https://stackoverflow.com/questions/tagged/wxwidgets
 - Please report bugs at http://trac.wxwidgets.org/newticket
 
 We would also gladly welcome [your contributions](CONTRIBUTING.md).