One more fix for Ruby 1.9.1 compatibility (String#map? Did that *ever* exist?)

ELLIOTTCABLE · ELLIOTTCABLE · commit 690b2de5a402 · 2009-02-12T06:45:54.000-09:00
Note: I'm not entirely sure if this is the correct fix, however, it fixes errors in the test suite, and I'll assume completeness on the part of the tests.
diff --git a/lib/git/lib.rb b/lib/git/lib.rb
@@ -551,7 +551,7 @@ def commit_tree(tree, opts = {})
       arr_opts = []
       arr_opts << tree
       arr_opts << "-p #{opts[:parent]}" if opts[:parent]
-      arr_opts += opts[:parents].map { |p| "-p #{p.to_s}" } if opts[:parents]
+      arr_opts += [opts[:parents]].flatten.map { |p| "-p #{p.to_s}" } if opts[:parents]
       arr_opts << "< #{t.path}"
       command('commit-tree', arr_opts)
     end
