Update free-programming-books-ko.md (#6380)

* Update free-programming-books-ko.md

* Update free-programming-books-ko.md

* Update free-programming-books-ko.md

* Update free-programming-books-ko.md

books/free-programming-books-ko.md

@@ -30,6 +30,7 @@
 * [Rust](#rust)
 * [Scratch](#scratch)
 * [Sed](#Sed)
+* [Software Engineering](#software-engineering)
 * [Springboot](#Springboot)
 * [Unicode](#unicode)
 
@@ -210,6 +211,11 @@
 * [sed stream editor](https://mug896.github.io/sed-stream-editor)
 
 
+### Software Engineering
+
+* [유의적 버전 명세 2.0.0-ko2](https://semver.org/lang/ko/) - Tom Preston-Werner, 김대현, et al.
+
+
 ### Springboot
 
 * [Springboot 2.X 정리](https://djunnni.gitbook.io/springboot) - 이동준