Describe index change and make formatting consistent

CHANGELOG.md

@@ -5,10 +5,11 @@
 * Allow delayed schedule of tasks, use clearer name for database columns
 * Add `get_many` helper to retrieve multiple tasks with a single DB call
 * Add `add_many` helper to insert multiple tasks with a single transaction
+* Create an index on the table, can now scale to millions of tasks
 
 ## 0.0.6 - 2024-02-13
 
-* adding a task now returns its UUID, previously nothing was returned
+* Adding a task now returns its UUID, previously nothing was returned
 
 ## 0.0.5 - 2023-11-06
 
@@ -17,18 +18,18 @@
 
 ## 0.0.4 - 2023-11-06
 
-* change name of `check_expired_leases()` to make it a public method
+* Change name of `check_expired_leases()` to make it a public method
 
 ## 0.0.3 - 2023-10-05
 
-* add function to delete old completed tasks
+* Add function to delete old completed tasks
 
 ## 0.0.2 - 2023-05-15
 
-* improve types and formatting
-* task is now in its own column, metadata is kept apart
-* upgrades to the CI/CD pipeline
+* Improve types and formatting
+* Task is now in its own column, metadata is kept apart
+* Upgrades to the CI/CD pipeline
 
 ## 0.0.1 - 2023-05-10
 
-* first release
+* First release