Add lua-resty-core and change upload-path

README.MD

@@ -17,7 +17,7 @@ Environment variables are used to provide configuration.
 
 Try it out:
 
-    curl localhost:8000/upload -d 'some data' -v
+    curl localhost:8000/ -d 'some data' -v
     ...
     > PUT /uploads HTTP/1.1
      ...