Sort 'table of contents' in alphabertical order

README.md

@@ -12,8 +12,8 @@
 - [Front-end Framework / Library](#build-your-own-front-end-framework--library)
 - [Game](#build-your-own-game)
 - [Git](#build-your-own-git)
-- [Neural Network](#build-your-own-neural-network)
 - [Network Stack](#build-your-own-network-stack)
+- [Neural Network](#build-your-own-neural-network)
 - [Operating System](#build-your-own-operating-system)
 - [Programming Language](#build-your-own-programming-language)
 - [Regex Engine](#build-your-own-regex-engine)