remove the second .next (#210)

mohammadameer · klyburke · commit 2ea33aa511b0 · 2019-04-21T07:15:39.000-07:00
there was 2 .next in the .gitignore file
diff --git a/book/1-start/.gitignore b/book/1-start/.gitignore
@@ -11,4 +11,3 @@ npm-debug.log
 node_modules/
 .coverage
 .env
-.next
