fix: version bug & trick

setup.py

@@ -2,6 +2,10 @@ import sys
 
 import setuptools
 
+sys.path.append("manim_slides")  # To avoid importing manim, which may not be installed
+
+from __version__ import __version__ as version
+
 if sys.version_info < (3, 7):
     raise RuntimeError("This package requires Python 3.7+")
 
@@ -10,7 +14,7 @@ with open("README.md", "r") as f:
 
 setuptools.setup(
     name="manim-slides",
-    version="3.0.0",
+    version=version,
     author="Jérome Eertmans (previously, Federico A. Galatolo)",
     author_email="jeertmans@icloud.com (resp., federico.galatolo@ing.unipi.it)",
     description="Tool for live presentations using manim",