README: start the process to fix the URL links

It's not needed to repeat the url using [url](url-again), just delete
the link syntax. Markdown will figure out what you mean.

This is a demo commit for a new contributor.
Signed-off-by: Mark Stenglein <mark@stengle.in>

README.md

@@ -23,10 +23,10 @@ contribute, so if you are struggling, or just want to learn, then we are
 willing to help.
 
 Check out some of the other What's Open projects!
- - [https://git.gmu.edu/srct/whats-open-android]()
- - [https://git.gmu.edu/srct/whats-open-ios]()
- - [https://git.gmu.edu/srct/whats-open-web]()
- - [https://git.gmu.edu/srct/whats-open-alexa]()
+ - https://git.gmu.edu/srct/whats-open-android
+ - https://git.gmu.edu/srct/whats-open-ios
+ - https://git.gmu.edu/srct/whats-open-web
+ - https://git.gmu.edu/srct/whats-open-alexa
 
 # Setup instructions for local development