Fix .pkgr.yml

.pkgr.yml

@@ -2,10 +2,7 @@ targets:
   ubuntu-14.04:
   ubuntu-12.04:
   debian-7:
-  centos6:
-build_dependencies:
-  - mercurial
-  - bzr
+  centos-6:
 dependencies:
   - git
 before: