Updated readme.

README.md

@@ -2,6 +2,10 @@
 
 ![Intermediate language everywhere!](images/banner.png)
 
+[![ECMA-335](https://img.shields.io/badge/ecma-335-blue)](https://www.ecma-international.org/publications-and-standards/standards/ecma-335/)
+[![Project Status: Active](https://www.repostatus.org/badges/latest/wip.svg)](https://www.repostatus.org/#wip)
+[![Last commit on devel branch](https://img.shields.io/github/last-commit/kekyo/IL2C/devel)](https://github.com/kekyo/IL2C/commits/devel)
+
 ## What's this?
 
 * IL2C is a translator (transpiler) of ECMA-335 CIL/MSIL to C language.
@@ -92,13 +96,13 @@ Following lists are auto-generated by unit test.
 
 |Configuration|Linux|Windows|
 |:--|:--|:--|
-|Release|[![CI build](https://github.com/kekyo/IL2C/workflows/Linux/badge.svg?branch=master)](https://github.com/kekyo/IL2C/actions)|[![CI build](https://github.com/kekyo/IL2C/workflows/Windows/badge.svg?branch=master)](https://github.com/kekyo/IL2C/actions)|
+|Release|[![CI build](https://github.com/kekyo/IL2C/workflows/Linux/badge.svg?branch=master)](https://github.com/kekyo/IL2C/actions?query=branch%3Amaster)|[![CI build](https://github.com/kekyo/IL2C/workflows/Windows/badge.svg?branch=master)](https://github.com/kekyo/IL2C/actions?query=branch%3Amaster)|
 
 ### devel
 
 |Configuration|Linux|Windows|
 |:--|:--|:--|
-|Release|[![CI build](https://github.com/kekyo/IL2C/workflows/Linux/badge.svg?branch=devel)](https://github.com/kekyo/IL2C/actions)|[![CI build](https://github.com/kekyo/IL2C/workflows/Windows/badge.svg?branch=devel)](https://github.com/kekyo/IL2C/actions)|
+|Release|[![CI build](https://github.com/kekyo/IL2C/workflows/Linux/badge.svg?branch=devel)](https://github.com/kekyo/IL2C/actions?query=branch%3Adevel)|[![CI build](https://github.com/kekyo/IL2C/workflows/Windows/badge.svg?branch=devel)](https://github.com/kekyo/IL2C/actions?query=branch%3Adevel)|
 
 ## License