dumpgenerator: AutoPEP8-fied

* Used autopep8 to made sure the code looks nice and is actually PEP8
  compliant.

Signed-off-by: mr.Shu <mr@shu.io>
Merge pull request #194 from mrshu/mrshu/dumpgenerator-pep8fied

dumpgenerator: AutoPEP8-fied