Update snapshot URLs

Author: headius

nightly.markdown

@@ -12,8 +12,8 @@ The most recent successful snapshot gets released on Github nightly.
 
 We also publish snapshots of our development branches after every successful CI run.
 
-[**JRuby dist**](https://oss.sonatype.org/content/repositories/snapshots/org/jruby/jruby-dist/): The installable distribution of JRuby is in the `jruby-bin` files. Unpack it, run `bin/jruby` and you're all set.
+[**JRuby dist**](https://central.sonatype.com/repository/maven-snapshots/org/jruby/jruby-dist/): The installable distribution of JRuby is in the `jruby-bin` files. Unpack it, run `bin/jruby` and you're all set.
 
-[**Complete jar**](https://oss.sonatype.org/content/repositories/snapshots/org/jruby/jruby-complete/): The "complete" jar, containing all standad libraries and preinstalled gems, is in the `jruby-complete...jar` file.
+[**Complete jar**](https://central.sonatype.com/repository/maven-snapshots/org/jruby/jruby-complete/): The "complete" jar, containing all standad libraries and preinstalled gems, is in the `jruby-complete...jar` file.
 
-[**Other artifacts**](https://oss.sonatype.org/content/repositories/snapshots/org/jruby/): The full complement of Maven artifacts are available as snapshots.
+[**Other artifacts**](https://central.sonatype.com/repository/maven-snapshots/org/jruby/): The full complement of Maven artifacts are available as snapshots.