Update version to 0.5.7 (#192)

Author: peter-quix

src/PythonClient/setup.py

@@ -5,7 +5,7 @@
 import re
 import fileinput
 
-package_version = "0.5.6.dev1"
+package_version = "0.5.7"
 
 with open("README.md", "r") as fh:
     long_description = fh.read()

src/builds/csharp/nuget/build_nugets.py

@@ -6,9 +6,9 @@
 import fileinput
 from typing import List
 
-version = "0.5.6.0"
-informal_version = "0.5.6.0-dev1"
-nuget_version = "0.5.6.0-dev1"
+version = "0.5.7.0"
+informal_version = "0.5.7.0"
+nuget_version = "0.5.7.0"
 
 
 def updatecsproj(projfilepath):