Adjust URL to HTTPs.

Author: dblock

CONTRIBUTING.md

@@ -1,7 +1,7 @@
 Contributing
 ============
 
-The http://www.ruby-grape.org site is work of [many contributors](https://github.com/ruby-grape/ruby-grape.github.io/graphs/contributors). You're encouraged to submit [pull requests](https://github.com/ruby-grape/ruby-grape.github.io/pulls) and [propose topics](https://github.com/ruby-grape/ruby-grape.github.io/issues). When in doubt, ask a question in the [Grape Google Group](http://groups.google.com/group/ruby-grape).
+The https://www.ruby-grape.org site is work of [many contributors](https://github.com/ruby-grape/ruby-grape.github.io/graphs/contributors). You're encouraged to submit [pull requests](https://github.com/ruby-grape/ruby-grape.github.io/pulls) and [propose topics](https://github.com/ruby-grape/ruby-grape.github.io/issues). When in doubt, ask a question in the [Grape Google Group](http://groups.google.com/group/ruby-grape).
 
 #### Fork the Project
 

README.md

@@ -1,6 +1,6 @@
 ![](images/grape.png)
 
 Grape is an opinionated framework for creating REST-like APIs in Ruby.
-This is the Jekyll source for the site at http://www.ruby-grape.org.
+This is the Jekyll source for the site at https://www.ruby-grape.org.
 
 Please contribute to this site, see [CONTRIBUTING](CONTRIBUTING.md).