Use HTTPS links iso. HTTP

The links are broken, but at least this stops triggering mixed-content
warnings.

Change-Id: Ia767786f4063aa5f2124db31a8aeeb154364a38a

README.md

diff --git a/README.md b/README.md
index 0cfffa8..512c02f 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@
 
 ## Alternatives
 
-[Java SyntaxHighlighter](http://code.google.com/p/java-syntax-highlighter/)
+[Java SyntaxHighlighter](https://code.google.com/p/java-syntax-highlighter/)
 
 ## Requirement
 
@@ -98,11 +98,11 @@
 
 ## Sample Screenshot
 
-![sample screenshot](http://java-prettify.googlecode.com/svn/wiki/ThemesDemo/ThemeDesert.png)
+![sample screenshot](https://java-prettify.googlecode.com/svn/wiki/ThemesDemo/ThemeDesert.png)
 
 ## Support & Discussion
 
-[Support & Discussion Group](http://groups.google.com/group/java-prettify)
+[Support & Discussion Group](https://groups.google.com/group/java-prettify)
 
 ## Known Issues