Update README.md (#13)

diff --git a/README.md b/README.md
index 6d1d993..16b75dd 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@
 
 Install kong-plugin-skywalking using `luarocks`:
 ```bash
-$ luarocks install kong-plugin-skywalking --local
+$ luarocks install kong-skywalking --local
 ```
 
 Edit kong.conf: