Update readme

ttgint · Feb 12, 2019 · 6d0a366 · 6d0a366
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 Simple server for single page applications.
 
+## Usage
+
+```
+$ serve -h
+Usage of serve:
+  -d string
+        the directory to host (default ".")
+  -p string
+        port to serve on (default "3000")
+  -r string
+        the root (index) file (default "index.html")
+```
+
+## Acknowledgments
+
 Based on [this work](https://gist.github.com/hauxe/f2ea1901216177ccf9550a1b8bd59178)