update readme with mdbook version

mark-i-m · mark-i-m · commit f53bd6dee6ca · 2018-08-20T11:19:02.000-05:00
diff --git a/README.md b/README.md
@@ -38,4 +38,4 @@ be found.
 > cargo install mdbook-linkcheck
 ```
 You will need `mdbook` version `>= 0.1`. `linkcheck` will be run automatically
-when you run `mdbook build`.
+when you run `mdbook build`. We are currently using `mdbook 0.2`.
