Update Summary

SUMMARY.md

@@ -1,12 +1,13 @@
 # Summary
 
-* [Instructions for using the curriculum](./INSTRUCTIONS.md)
+* [Instructions](./INSTRUCTIONS.md)
 * [Hello World](./chapter1/README.md)
 * [Variables and Statements](./chapter2/README.md)
 * [Messages and Interfaces](./chapter3/README.md)
 * [Flow of Control](./chapter4/README.md)
 * [Other Objects](./chapter5/README.md)
 * [Advanced Flow of Control](./chapter6/README.md)
-* [Arrays](./chapter7/README.md) :construction:
-* [Functions](./chapter8/README.md) :construction:
-* [Classes](./chapter9/README.md) :construction:
+* [Arrays](./chapter7/README.md)
+* [Hashes](./chapter8/README.md)
+* [Methods](./chapter9/README.md)
+* [Classes](./chapter10/README.md)