Adding percentage-formatting support for --br pyslha-1.0.7

Adding a variant of the gravitino rendering supplied by Martin Spinrath

Adding a new spectrum file from Martin Spinrath

Adding a draft changelog

Added tag pyslha-1.0.6 for changeset 4f426f1f5923

Merge in a version of decay line color scaling in proportion to branching ratio, from Martin Spinrath pyslha-1.0.6

Added tag pyslha-1.0.5 for changeset 0502c4942fbc

Fix units issue in slhaplot -- thanks to Martin Spinrath! pyslha-1.0.5

Ignore setup build and dist directories

Added tag pyslha-1.0.4 for changeset 513c294bc9dd

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