Correct changelog entries for v108, v109 and v110 (#469)

Found by diffing the published buildpack archives and looking at the
git log to see what changed. It looks like the v108 entry was
accidentally added in #405, when the release being published there
was actually v107. The setuptools update mentioned there never
happened, since the `SETUPTOOLS_VERSION` variable was found to be
unused and instead removed.

CHANGELOG.md

@@ -28,17 +28,17 @@ Linting, bugfixes.
 
 # 110
 
-Update Default Python to 3.6.1, bugfixes.
-
-- Fixed automatic pip uninstall of dependencies removed from requirements.txt.
+Update default Python to 3.6.2.
 
 # 109
 
-Fix output for collectstatic step.
+Update Default Python to 3.6.1, bugfixes.
+
+- Fixed automatic pip uninstall of dependencies removed from requirements.txt.
 
 # 108
 
-Updated setuptools.
+Fix output for collectstatic step.
 
 # 107