Build: Upgrade version to v0.15.0 (#342)

Author: skytin1004

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "co_op_translator"
-version = "0.14.1"
+version = "0.15.0"
 description = "Easily automate the translation of your documentation into multiple languages to reach a global audience."
 authors = [
     "Minseok Song <minseok.song@mssong.com>",