doc: fix typo (#41)

Author: bripkens

packages/opencensus-exporter-zipkin/README.md

@@ -7,7 +7,7 @@ This project is still at an early stage of development. It's subject to change.
 
 ## Installation
 
-Install OpenCensus Zipikin Exporter with:
+Install OpenCensus Zipkin Exporter with:
 ```bash
 npm install @opencensus/nodejs
 npm install @opencensus/exporter-zipkin
@@ -68,4 +68,4 @@ tracing.registerExporter(exporter).start();
 - For help or feedback on this project, join us on [gitter](https://gitter.im/census-instrumentation/Lobby)
 
 [gitter-image]: https://badges.gitter.im/census-instrumentation/lobby.svg
-[gitter-url]: https://gitter.im/census-instrumentation/lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
+[gitter-url]: https://gitter.im/census-instrumentation/lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge