add reference to the blog post

nikomatsakis · web-flow · commit 61a93e03772c · 2018-05-20T06:08:15.000-04:00
diff --git a/README.md b/README.md
@@ -32,4 +32,6 @@ fn main() {
     // extract the final results.
     let reachable: Vec<(u32,u32)> = variable.complete();
 }
-```
+```
+
+If you'd like to read more about how it works, check out [this blog post](https://github.com/frankmcsherry/blog/blob/master/posts/2018-05-19.md).

Original file line number	Diff line number	Diff line change
`@@ -32,4 +32,6 @@ fn main() {`
`32`	`32`	`// extract the final results.`
`33`	`33`	`let reachable: Vec<(u32,u32)> = variable.complete();`
`34`	`34`	`}`
`35`		-```
	`35`	+```
	`36`	`+`
	`37`	`+If you'd like to read more about how it works, check out [this blog post](https://github.com/frankmcsherry/blog/blob/master/posts/2018-05-19.md).`