Update change log for 0.9.0.

Author: python-processing-unit

docs/CHANGELOG.html

@@ -86,6 +86,24 @@
 
 ---
 
+## 0.9.0
+
+### Major changes
+
+Update search paths.
+
+Replace `.prex` files with the `EXTEND` operator.
+
+### Minor changes
+
+N/A
+
+### Patches
+
+Serialize index assignment.
+
+---
+
 ## 0.8.0
 
 ### Major changes
@@ -154,14 +172,6 @@
 
 ## 0.7.2
 
-### Major features
-
-N/A
-
-### Minor features
-
-N/A
-
 ### Patches
 
 Rewrite the documentation.
@@ -170,14 +180,6 @@
 
 ## 0.7.1
 
-### Major features
-
-N/A
-
-### Minor features
-
-N/A
-
 ### Patches
 
 Allow symbol creation via `ASSIGN`.
@@ -246,14 +248,6 @@
 
 ## 0.4.1
 
-### Major features
-
-N/A
-
-### Minor features
-
-N/A
-
 ### Patches
 
 Fix contradiction in specification regarding `FOR`.