Retarget CI badge in README.md

Since this appears to be a long-running fork, let's point at our own CI so we don't fool ourselves ..

Author: squaremo

README.md

@@ -1,6 +1,6 @@
 # v8worker2
 
-[![Build Status](https://travis-ci.org/ry/v8worker2.svg?branch=master)](https://travis-ci.org/ry/v8worker2)
+[![Build Status](https://travis-ci.org/jkcfg/v8worker2.svg?branch=master)](https://travis-ci.org/jkcfg/v8worker2)
 
 This is a minimal binding between Go (golang) and V8 JavaScript. Basic concept
 is to only expose two methods to JavaScript: send and receive.