misc update

LICENSE

-Copyright (c) 2010-2016 Vincent Hanquez <vincent@snarc.org>
+Copyright (c) 2010-2019 Vincent Hanquez <vincent@snarc.org>
 
 All rights reserved.
 

README.md

@@ -7,13 +7,14 @@ git
 
 git is a reimplementation of git storage and protocol in pure haskell.
 
-what it does do:
+What it does do:
 
 * read loose objects, and packed objects.
 * write new loose objects
 * git like operations available: commit, cat-file, verify-pack, rev-list, ls-tree.
+* diff between commits
 
-what is doesn't do:
+What is doesn't do:
 
 * reimplement the whole of git.
 * checkout's index reading/writing, fetching, merging, diffing.