chore version: bump to 0.2.0
chore bin: build binary version of 0.2.0
Merge branch 'release-0.2.0'

* release-0.2.0:
  chore bin: build binary version of 0.2.0
  chore version: bump to 0.2.0
  chore deps: update to latest dependecies
  docs: update CHANGELOG and README
  chore deps: update commander to 0.2.3
  chore complexity: lower threshold for log module
  chore cli: lowercase help output
  refactor test: fix expectation
  refactor test: remove obsolete test
  test: add test for error callback
  refactor markdown-reporter: make use of promises
  style: remove some blank lines
  chore test: reduce timeout for test to 250ms
  refactor test: update stubbing to work w/ promises
  refactor test: reset stub and improve description
  refactor test: we don't throw errors anymore
  refactor test: update stubbing to work w/ promises
  refactor lib: merge options w/ default options
  feat(cli-options): suppress email via --no-email option
  refactor lib: reject w/ error when repo not exits
  refactor binary-footer: change merge options order
  refactor: add internal success/error handler
  style indent: use two spaced indention
  refactor: rename internal functions
  refactor: remove unused method
  wip: refactor to promise-based approach