[docco] Add note

[Jamie Nguyen]

commit d55f191f592ef0090d3846663292e2fc1fefcc21
Author: Jamie Nguyen <j at jamielinux.com>
Date:   Sat Apr 26 19:51:57 2014 +0100

    Add note

 docco.spec |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/docco.spec b/docco.spec
index dc17847..4da0585 100644
--- a/docco.spec
+++ b/docco.spec
@@ -1,5 +1,7 @@
 %{?nodejs_find_provides_and_requires}
 
+# NOTE TO SELF: do not update beyond 0.6.2 on fedora < 21 || rhel < 7
+
 %global docs %{_docdir}/%{name}-%{version}
 
 %if 0%{?fedora} >= 20