Spring-2021.md

@@ -76,7 +76,7 @@
 
 - Book progress:
   - Chapter 29 code and notes ✅
-  - Chapter 30 code and notes
+  - Chapter 30 code and notes ✅
 - Challenges:
   - Resolve all merge conflicts and merge all branches into `main`
   - `init()` optimization (issue #47)