Stop using emoji that can cause encoding issue on Windows

README.md

@@ -17,7 +17,7 @@
   | <a href="#installation"><b>Installation</b></a>
   | <a href="#usage"><b>Usage</b></a>
   | <a href="#examples"><b>Examples</b></a>
-  | <a href="https://x.com/labelmeai"><b>𝕏 (@labelmeai)</b></a>
+  | <a href="https://x.com/labelmeai"><b>X/Twitter</b></a>
   <!-- | <a href="https://github.com/wkentaro/labelme/discussions"><b>Community</b></a> -->
   <!-- | <a href="https://www.youtube.com/playlist?list=PLI6LvFw0iflh3o33YYnVIfOpaO0hc5Dzw"><b>Youtube FAQ</b></a> -->
 </div>

setup.py

@@ -69,7 +69,7 @@ def get_install_requires():
 
 
 def get_long_description():
-    with open("README.md", encoding="utf8") as f:
+    with open("README.md") as f:
         long_description = f.read()
     try:
         # when this package is being released