fix(CHANGELOG): prep for changelog script

This change is necessary to accomodate for generate-changelog.sh
available in contrib/util. With these changes, it's as easy as

    $ ./contrib/util/generate-changelog.sh v0.7.0 v0.8.0 | cat - CHANGELOG.md > tmp && mv tmp CHANGELOG.md

Which will generate the changes from v0.7.0 to v0.8.0 and append the
output to the top of CHANGELOG.md. The title was redundant, anyways.

Author: Matthew Fisher

CHANGELOG.md

@@ -1,5 +1,3 @@
-## Change Log
-
 ### v0.8.0 (2014/05/06 18:30 +00:00)
 - [54ff9ca](https://github.com/deis/deis/commit/54ff9caaaaa2be20960afe41c883014a796b81b2) Updated CLI binaries and links in client README. (@mboersma)
 - [4694844](https://github.com/deis/deis/commit/4694844e603583d2b0cee0fa0b4922a9857dc5d9) Switch master to v0.8.0. (@mboersma)
@@ -1460,4 +1458,4 @@
 - [4ebd123](https://github.com/deis/deis/commit/4ebd123a1c37c539ea3e8a1909d4e5b422d8441c) standardize list and info cli output (@gabrtv)
 - [abbc10a](https://github.com/deis/deis/commit/abbc10a2a0b6006353cc467cb87813293713c7df) fix flake8 line length (@gabrtv)
 - [8834b94](https://github.com/deis/deis/commit/8834b946a99a40828a5e6ef01d06adab67e17e22) check for valid flavor on formations:create, add time-based done output #16 (@gabrtv)
-- [72b8345](https://github.com/deis/deis/commit/72b8345ac6557a2c4707208a13a2c407478f740b) update in prep for 0.0.4 release (@gabrtv)
+- [72b8345](https://github.com/deis/deis/commit/72b8345ac6557a2c4707208a13a2c407478f740b) update in prep for 0.0.4 release (@gabrtv)