Update pre_gen_project.py (#164)

Bugfix for check for underscores in plugin name. Must use re.search (not re.match) to detect an underscore anywhere in the plugin name string.

hooks/pre_gen_project.py

@@ -13,6 +13,6 @@
     logger.error(f"  More info: {link}")
     sys.exit(1)
 
-if re.match(r"_", "{{cookiecutter.plugin_name}}"):
+if re.search(r"_", "{{cookiecutter.plugin_name}}"):
     logger.error("PyPI.org and pip discourage package names with underscores.")
     sys.exit(1)