use https for readme links which support it

README.md

@@ -17,7 +17,7 @@ same codebase, you can target Windows, OS X, Linux, Android and iOS. All Kivy
 widgets are built with multitouch support.
 
 Kivy is MIT licensed, actively developed by a great community and is supported
-by many projects managed by the [Kivy Organization](http://kivy.org/#organization).
+by many projects managed by the [Kivy Organization](https://kivy.org/#organization).
 
 [![Coverage Status](https://coveralls.io/repos/kivy/kivy/badge.svg?branch=master)](https://coveralls.io/r/kivy/kivy?branch=master)
 [![Build Status](https://travis-ci.org/kivy/kivy.svg?branch=master)](https://travis-ci.org/kivy/kivy)
@@ -28,8 +28,8 @@ Installation, Documentation and Examples
 ----------------------------------------
 
 Extensive installation instructions as well as tutorials and general
-documentation, including an API reference, can be found at http://kivy.org/docs.
-A [PDF version](http://kivy.org/docs/pdf/Kivy-latest.pdf) is also available.
+documentation, including an API reference, can be found at https://kivy.org/docs.
+A [PDF version](https://kivy.org/docs/pdf/Kivy-latest.pdf) is also available.
 
 Kivy ships with many examples which can be found in the `examples` folder.
 
@@ -51,7 +51,7 @@ Contributing
 ------------
 
 We love pull requests and discussing novel ideas. Check out our
-[contribution guide](http://kivy.org/docs/contribute.html) and
+[contribution guide](https://kivy.org/docs/contribute.html) and
 feel free to improve Kivy.
 
 The following mailing list and IRC channel are used exclusively for
@@ -69,23 +69,23 @@ IRC channel:
 Sister projects
 ---------------
 
-- [Buildozer](http://github.com/kivy/buildozer): generic Python packager
+- [Buildozer](https://github.com/kivy/buildozer): generic Python packager
   for Android and iOS.
-- [Plyer](http://github.com/kivy/plyer): platform-independent Python wrapper
+- [Plyer](https://github.com/kivy/plyer): platform-independent Python wrapper
   for platform-dependent APIs.
-- [Pyjnius](http://github.com/kivy/pyjnius): dynamic access to the Java/Android
+- [Pyjnius](https://github.com/kivy/pyjnius): dynamic access to the Java/Android
   API from Python.
-- [Pyobjus](http://github.com/kivy/pyobjus): dynamic access to the
+- [Pyobjus](https://github.com/kivy/pyobjus): dynamic access to the
   Objective-C/iOS API from Python.
 - [Python for Android](http://github.com/kivy/python-for-android): toolchain
   for building and packaging Python applications for Android.
-- [Kivy iOS](http://github.com/kivy/kivy-ios): toolchain for building and
+- [Kivy iOS](https://github.com/kivy/kivy-ios): toolchain for building and
   packaging Kivy applications for iOS.
-- [Audiostream](http://github.com/kivy/audiostream): library for direct access
+- [Audiostream](https://github.com/kivy/audiostream): library for direct access
   to the microphone and speaker.
 - [Kivy Designer](http://github.com/kivy/kivy-designer): UI designer for Kivy.
-- [KivEnt](http://github.com/kivy/kivent): entity-based game engine for Kivy.
-- [Garden](http://github.com/kivy-garden): widgets and libraries created and 
+- [KivEnt](https://github.com/kivy/kivent): entity-based game engine for Kivy.
+- [Garden](https://github.com/kivy-garden): widgets and libraries created and
   maintained by users.
 
 Licenses
@@ -95,9 +95,9 @@ Licenses
   LICENSE file.
 - The provided fonts Roboto and Roboto Mono are licensed and
   distributed under the terms of the
-  [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0).
+  [Apache License, Version 2.0](https://www.apache.org/licenses/LICENSE-2.0).
   The DejaVuSans (used for the virtual keyboard) license can be viewed
   [here](http://dejavu-fonts.org/wiki/License).
 - The current UI design has been adapted from Moblintouch theme's SVGs
   and is licensed under the terms of the
-  [LGPLv2.1](http://www.gnu.org/licenses/old-licenses/lgpl-2.1).
+  [LGPLv2.1](https://www.gnu.org/licenses/old-licenses/lgpl-2.1).