remove 'v' prefix in front of version when formatting LaTeX3 files

formatter/tex_formatter.py

@@ -10,7 +10,8 @@ from PyTeX.base import Attributes, Args
 class TexFormatter:
     def __init__(self, name: str, author: str, header: Optional[List[str]], file_extension: str,
                  tex_version: str, version: str, latex_name: str):
-        self.version = version
+
+        self.version = version[1:] if version.startswith('v') else version
         self.header = header
         self.name_raw = name
         self.author = author