Bump project version to v1.0.0b5 (#31)

This changes the project version from v1.0.0b4 to v1.0.0b5.

Changes that will be released:
- Switch from pip-tools to Poetry
- Removal of URL rewrites from the IP filtering feature in favor of socket-level IP address pinning

pyproject.toml

@@ -10,7 +10,7 @@ authors = [
     "Saleor Commerce <[email protected]>"
 ]
 license = "BSD-3-Clause"
-version = "1.0.0b4"
+version = "1.0.0b5"
 classifiers = [
     "Development Status :: 4 - Beta",
     "Intended Audience :: Developers",