Bump backoff dependency to 1.10.0 (#36)

Author: mands

setup.py

@@ -14,7 +14,7 @@
 PostHog is developer-friendly, self-hosted product analytics. posthog-python is the python package.
 """
 
-install_requires = ["requests>=2.7,<3.0", "six>=1.5", "monotonic>=1.5", "backoff==1.6.0", "python-dateutil>2.1"]
+install_requires = ["requests>=2.7,<3.0", "six>=1.5", "monotonic>=1.5", "backoff==1.10.0", "python-dateutil>2.1"]
 
 extras_require = {
     "dev": [