Change Edge to alpha

Author: jingming

VERSIONS.md

@@ -35,7 +35,7 @@ functionality will only be added to the current version.  The current version -
 1 will continue to be supported with bugfixes and security updates, but no new 
 features.
 
-## Edge Features (Edge Branch)
+## Edge Features (alpha Branch)
 
 Twilio frequently rolls out new features in public and private beta periods.
 Twilio strives to ship early and often and bake customer feedback back into our 
@@ -61,4 +61,4 @@ in the stable artifact, with a `MAJOR` or `MINOR` version bump.
 To use an `Edge` artifact in your JAVA project you will have to make sure that 
 you pin the artifact with `alpha` stability in your `pom.xml`.
 
-[semver]: http://semver.org/
+[semver]: http://semver.org/