Cleanup main after cutting new 1.9.latest branch (#1419)

* Clean up changelog on main

* Bumping version to 1.10.0a1

* Code quality cleanup

Author: FishtownBuildBot

.bumpversion.cfg

@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 1.9.0b1
+current_version = 1.10.0a1
 parse = (?P<major>[\d]+) # major version number
 	\.(?P<minor>[\d]+) # minor version number
 	\.(?P<patch>[\d]+) # patch version number