Bump default timeline template to 2.0

Changes

• Upgrade default template to 2.0

>>> Timeline().version
<Version('2.0')>

• Add explicit version support (from packaging).

• Fix new template header size (3 in ≥ 2.0 and 2 before). This value is based on the template version.

>>> Timeline().header
3

• Fix new sheet name for change log (template change log in ≥ 2.0 and change log before). Both cases are still supported

• Add new science property to Timeline object (only for timeline version ≥ 2.0, raise a ValueError before).

>>> Timeline('timemline.xlsm').science

• Bump patch version to 0.0.4

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Fix #4 (closed)