fix objc, add python

Author: ben

en/book/10-git-in-other-environments/chapter10.asc

@@ -288,7 +288,8 @@ Again, here's how to read HEAD's commit message:
 
 [source,objc]
 -----
-GTRepository *repo = [[GTRepository alloc] initWithURL:[NSURL fileURLWithPath:"/path/to/repo"] error:NULL];
+GTRepository *repo =
+    [[GTRepository alloc] initWithURL:[NSURL fileURLWithPath: @"/path/to/repo"] error:NULL];
 GTReference *head = [repo headReferenceWithError:NULL];
 GTCommit *tip = head.resolvedTarget;
 NSString *message = tip.message;
@@ -315,7 +316,7 @@ As always, HEAD's commit message:
 
 [source,python]
 ----
-# TODO
+pygit2.Repository("/path/to/repo").head.resolve().get_object().message
 ----