update docs with method and protocol options

Author: respectTheCode

README.md

@@ -17,6 +17,8 @@ All options are optional.
 * `dogstatsd` node-dogstatsd client. `default = new require("node-dogstatsd").StatsD()`
 * `stat` *string* name for the stat. `default = "node.express.router"`
 * `tags` *array* of tags to be added to the histogram. `default = []`
+* `method` *boolean* include http method tag. `default = false`
+* `protocol` *boolean* include protocol tag. `default = false`
 
 
 ## License