Update travis-ci badge to point at the dev branch

README.md

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-![](https://raw.github.com/wiki/brettwooldridge/HikariCP/Hikari.png)&nbsp;HikariCP <sup><sup>It's Faster.</sup></sup>&nbsp;[![Build Status](https://travis-ci.org/brettwooldridge/HikariCP.png?branch=master)](https://travis-ci.org/brettwooldridge/HikariCP)&nbsp;[![Coverage Status](https://coveralls.io/repos/brettwooldridge/HikariCP/badge.png?branch=dev)](https://coveralls.io/r/brettwooldridge/HikariCP?branch=dev)<img src='https://raw.github.com/wiki/brettwooldridge/HikariCP/space60x1.gif'><sup><sup>[![](https://raw.github.com/wiki/brettwooldridge/HikariCP/twitter.png)](https://twitter.com/share?text=Interesting%20JDBC%20Connection%20Pool&hashtags=HikariCP&url=https%3A%2F%2Fgithub.com%2Fbrettwooldridge%2FHikariCP)</sup></sup><br><sub><sub><sup>Hi·ka·ri [hi·ka·'lē] &#40;*Origin: Japanese*): light; ray.</sup></sub></sub>
+![](https://raw.github.com/wiki/brettwooldridge/HikariCP/Hikari.png)&nbsp;HikariCP <sup><sup>It's Faster.</sup></sup>&nbsp;[![Build Status](https://travis-ci.org/brettwooldridge/HikariCP.png?branch=dev)](https://travis-ci.org/brettwooldridge/HikariCP)&nbsp;[![Coverage Status](https://coveralls.io/repos/brettwooldridge/HikariCP/badge.png?branch=dev)](https://coveralls.io/r/brettwooldridge/HikariCP?branch=dev)<img src='https://raw.github.com/wiki/brettwooldridge/HikariCP/space60x1.gif'><sup><sup>[![](https://raw.github.com/wiki/brettwooldridge/HikariCP/twitter.png)](https://twitter.com/share?text=Interesting%20JDBC%20Connection%20Pool&hashtags=HikariCP&url=https%3A%2F%2Fgithub.com%2Fbrettwooldridge%2FHikariCP)</sup></sup><br><sub><sub><sup>Hi·ka·ri [hi·ka·'lē] &#40;*Origin: Japanese*): light; ray.</sup></sub></sub>
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 Fast, simple, reliable.  HikariCP is a "zero-overhead" production ready JDBC connection pool.  Coming in at roughly 70Kb, the library is very light.  Read about [how we do it here](https://github.com/brettwooldridge/HikariCP/wiki/Down-the-Rabbit-Hole).