Fixed links in README

README.md

@@ -6,19 +6,19 @@ Greetings adventurous students, developers, hackers, and makers!  RVR is one of
 
 ### Getting Started
 
-Visit our [Getting Started](http://sdk.sphero.com/getting_started) to learn more about the ins-and-outs of working with RVR, including some important details on the getting started process.
+Visit our [Getting Started](https://sdk.sphero.com/getting_started) to learn more about the ins-and-outs of working with RVR, including some important details on the getting started process.
 
 ### More information and documentation
 
-Visit our [SDK website](sdk.sphero.com) to find more information about RVR, the SDK and the API!
+Visit our [SDK website](https://sdk.sphero.com) to find more information about RVR, the SDK and the API!
 
 ### Where to get help
 
 Visit our [community forum](https://community.sphero.com/c/advanced-programming) to get help, share your project, or help others!
 
 ### Staying up to date
 
-Consider [signing up](http://sdk.sphero.com/sign-up) for our SDK email list to stay current on new features being released in our robot firmware as well as our SDKs, including new platform / language support.  
+Consider [signing up](https://sdk.sphero.com/sign-up) for our SDK email list to stay current on new features being released in our robot firmware as well as our SDKs, including new platform / language support.  
 
 ## About the Raspberry Pi Client.js SDK