또또 리드미 수정

readme-en.md

@@ -15,7 +15,7 @@ openNAMU is a Python-based wiki engine. You can use openNAMU by installing Pytho
  * [Authors](#authors)
  * [Etc.](#etc)
 
-# Getting Started
+## Getting Started
 openNAMU is based upon Python, and it requires a Python environment.
 
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