[rubygem-fakefs] Add comment with patch source.

[Vít Ondruch]

commit 31e50e0a46af36b5a50559aa18d61f2580056a38
Author: Vít Ondruch <vondruch at redhat.com>
Date:   Mon Jun 23 12:47:05 2014 +0200

    Add comment with patch source.

 rubygem-fakefs.spec |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/rubygem-fakefs.spec b/rubygem-fakefs.spec
index ffaedd2..3a58dda 100644
--- a/rubygem-fakefs.spec
+++ b/rubygem-fakefs.spec
@@ -9,6 +9,8 @@ Group: Development/Languages
 License: MIT
 URL: http://github.com/defunkt/fakefs
 Source0: http://rubygems.org/gems/%{gem_name}-%{version}.gem
+# Fix encoding for Ruby 2.1+.
+# https://github.com/onehub/fakefs/commit/3f92cc3d5fe1ace84e107a6d37b1c98fd7db7029
 Patch0: rubygem-fakefs-0.5.2-Force-encoding-for-binary-string-literal.patch
 BuildRequires: ruby(release)
 BuildRequires: rubygems-devel