Set version to 4.0.0

Since the plugin has been renamed, we better keep using the versioning
of the original plugin. The last version of httpie-credential-store is
3.1.0, which means next major version is 4.0.0.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "httpie-auth-store"
-version = "1.0.0"
+version = "4.0.0"
 description = "HTTPie: one auth to rule them all!"
 authors = ["Ihor Kalnytskyi <[email protected]>"]
 license = "MIT"