Merge pull request #723 from crate/m/crate_0.48.4

update crate to new stable version 0.48.4

library/crate

@@ -4,8 +4,8 @@
 
 # see also https://crate.io
 
-latest: git://github.com/crate/[email protected].2
+latest: git://github.com/crate/[email protected].4
 0.47: git://github.com/crate/[email protected]
 0.47.9: git://github.com/crate/[email protected]
-0.48: git://github.com/crate/[email protected].2
-0.48.2: git://github.com/crate/[email protected]
+0.48: git://github.com/crate/[email protected].4
+0.48.4: git://github.com/crate/[email protected]