spelling error in changes for 0.6.0

in changes file, Release 0.6.0 has spelling mistake for headers.
Merge pull request #174 from vinu76jsr/master

spelling error in changes for 0.6.0
Initial support for including VBA macros.
Added in_memory support for vba files.
Renamed pep8 target.
Guidelines for Bug Reports and Pull Requests.
Added utility to extract vbaProject files.