Update SAFE URL.

Point to mainline.

Author: khatchad

README.md

@@ -52,7 +52,7 @@ The refactoring has several dependencies as listed below. If you experience any
 Dependency | Update Site
 --- | ---
 [WALA](https://github.com/ponder-lab/WALA) | https://raw.githubusercontent.com/ponder-lab/WALA/master/com.ibm.wala.updatesite
-[SAFE](https://github.com/ponder-lab/safe) | https://raw.githubusercontent.com/ponder-lab/safe/master/com.ibm.safe.updatesite
+[SAFE](https://github.com/tech-srl/safe) | https://raw.githubusercontent.com/tech-srl/safe/master/com.ibm.safe.updatesite
 [Common Eclipse Java Refactoring Framework](https://github.com/ponder-lab/Common-Eclipse-Java-Refactoring-Framework) | https://raw.githubusercontent.com/ponder-lab/Common-Eclipse-Java-Refactoring-Framework/master/edu.cuny.citytech.refactoring.common.updatesite
 
 #### WALA