bumping version

Author: Paul Santa Clara

CHANGELOG.md

@@ -31,3 +31,6 @@
 
 ## 5.0.5
   * Sets the default format for dates to use %04Y so dates < 1000 are formatted with leading zeroes [#65](https://github.com/singer-io/singer-python/pull/65)
+
+## 5.7.0
+  * Bumping backoff dependency to 1.8.0 for aiohttp support

setup.py

@@ -4,7 +4,7 @@
 import subprocess
 
 setup(name="singer-python",
-      version='5.6.1',
+      version='5.7.0',
       description="Singer.io utility library",
       author="Stitch",
       classifiers=['Programming Language :: Python :: 3 :: Only'],