Adds missing forward slash to GraphiQL link (#78)

The text of the GraphiQL link was missing a forward slash, added for the benefit of folks who might be copy and pasting it out from the README to take a look at it.
gatsbyjs · Oct 9, 2018 · bdf147f · bdf147f
1 parent 6861352
commit bdf147f
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/README.md b/README.md
@@ -44,7 +44,7 @@ _Have another more specific idea? You may want to check out our vibrant collecti
 
     Your site is now running at `http://localhost:8000`!
 
-    *Note: You'll also see a second link: `http://localhost:8000___graphql`. This is a tool you can use to experiment with querying your data. Learn more about using this tool in the [Gatsby tutorial](https://www.gatsbyjs.org/tutorial/part-five/#introducing-graphiql).*
+    *Note: You'll also see a second link: `http://localhost:8000/___graphql`. This is a tool you can use to experiment with querying your data. Learn more about using this tool in the [Gatsby tutorial](https://www.gatsbyjs.org/tutorial/part-five/#introducing-graphiql).*
     
     Open the the `my-default-starter` directory in your code editor of choice and edit `src/pages/index.js`. Save your changes and the browser will update in real time!