Update gemspec to 0.9.0 (#216)

bump version to 0.6.1

Summary:
This version bump includes a backwards compatibility fix to expose the
hubspot rake tasks to users and adds deprecation warnings.

Bump version to 0.6.0

Bump version to 0.5.0

Bump the version to 0.4.0

Merge pull request #90 from alice-financial/fix-rspec-its

Pin rspec to 2.x

Regenerate gemspec for version 0.1.2

Regenerate gemspec for version 0.1.1

Regenerate gemspec for version 0.1.0