minor: use travis svg shields

TylerBrock · TylerBrock · commit 975552961321 · 2014-03-27T16:36:52.000-04:00
diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-# MongoDB C++ Driver [![Build Status](http://img.shields.io/travis/mongodb/mongo-cxx-driver/26compat.svg)](https://travis-ci.org/mongodb/mongo-cxx-driver)
+# MongoDB C++ Driver [![Build Status](https://travis-ci.org/mongodb/mongo-cxx-driver.svg?branch=26compat)](https://travis-ci.org/mongodb/mongo-cxx-driver)
 Welcome to the MongoDB C++ Driver!
 
 Use this branch if:

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-# MongoDB C++ Driver [![Build Status](http://img.shields.io/travis/mongodb/mongo-cxx-driver/26compat.svg)](https://travis-ci.org/mongodb/mongo-cxx-driver)`
	`1`	`+# MongoDB C++ Driver [![Build Status](https://travis-ci.org/mongodb/mongo-cxx-driver.svg?branch=26compat)](https://travis-ci.org/mongodb/mongo-cxx-driver)`
`2`	`2`	`Welcome to the MongoDB C++ Driver!`
`3`	`3`
`4`	`4`	`Use this branch if:`