Add missing link to #737 in README

I guess GitHub doesn't auto-link issues in README.md.
gratipay · Jul 22, 2013 · 3d008fe · 3d008fe
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commit 3d008fe
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/README.md b/README.md
@@ -484,4 +484,4 @@ and [crowdsourcing.org's](http://www.crowdsourcing.org/directory)*
  - [Generous](http://genero.us/) - Pay-what-you-want platform
  - [FundAnything](http://fundanything.com/) - Kickstarter knock-off, I guess?
  - [ShareTribe](https://www.sharetribe.com/) - Create your own community marketplace
- - [Subbable](https://subbable.com/) - What John and Hank Green wanted (cf. #737)
+ - [Subbable](https://subbable.com/) - What John and Hank Green wanted (cf. [#737](https://github.com/gittip/www.gittip.com/issues/737))