Api updates (#7)

* move all instantiation options into the opts hash

* 2.0.0

CHANGELOG.md

@@ -0,0 +1,25 @@
+# Changelog
+
+This package is [semantic versioned](http://semver.org/)
+
+## 2.0.0
+
+- [api change]: move `store` and `protocol` options from arguments to the  opts` hash
+
+e.g. for an instantiation in 1.0.0 like:
+
+```
+Vue.use(VueNativeSock, 'ws://localhost:9090', 'my-protocol', store, { format: 'json' })
+```
+
+is now, in 2.0.0:
+
+```
+Vue.use(VueNativeSock, 'ws://localhost:9090', { protocol: 'my-protocol', store: store, format: 'json' })
+```
+
+- [bugfix]: allow json message passing without a namespace
+
+## 1.0.0
+
+First release