Update part 7 publish date.

cstack · cstack · commit fee33d344d4f · 2017-09-23T16:30:27.000-07:00
diff --git a/_parts/part7.md b/_parts/part7.md
@@ -1,6 +1,6 @@
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 title: Part 7 - Introduction to the B-Tree
-date: 2017-09-19
+date: 2017-09-23
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 The B-Tree is the data structure SQLite uses to represent both tables and indexes, so it's a pretty central idea. This article will just introduce the data structure, so it won't have any code.
