Correct default mdbook port

jamesmunns · jamesmunns · commit 2043a2a4409e · 2018-04-01T14:01:20.000+02:00
diff --git a/embedded-rust-book/README.md b/embedded-rust-book/README.md
@@ -11,7 +11,7 @@ cargo install mdbook
 cd embedded-rust-book
 mdbook serve
 
-# open a web browser, go to http://localhost:3001
+# open a web browser, go to http://localhost:3000
 ```
 
 ## License
