bump version: 2.0.0 -> 3.0.0

improved windows support

Correctly open UTF-8-encoded locustfiles on Windows.

Merge pull request #71 from zalando-incubator/support-locust-1.0

Support Locust >=1

update unit tests

Merge pull request #70 from zalando-incubator/warn-too-recent-locust

Warn about locust>=0.99

Merge pull request #64 from zalando-incubator/release-path-fix

Release the changes from #63

Merge pull request #62 from zalando-incubator/issue-61

locust_taskset: take Task2 into account when checking for Task

Merge pull request #60 from zalando-incubator/fix-readme-rendering

Make README compliant with PyPI RST renderer

Merge pull request #55 from zalando-incubator/fix-pushing-tags

Fix pushing tags: overwrite if tag already exists