Release v1.0.0

No new features, just touch ups on the docs

Rename of GitHub user profile

Add tests skipping invalid tags

This is a fallout of 6a753e3 and fixes
the broken tests from that commit. In addition this commit adds a small
number of test cases that check if the behaviour is actually working.

Probably this can be extended if necessary but the logic is not hugely
complicated right now.

Add new `-i` flag that allows to skip non SemVer tags

Useful for repositories that just have an old tag that is malformed.

Not sure I like the way the shell docs work now but I have not thought
of a decent way to document flags and args at the same time using just
standard lib ways. The usage prints okay, but the `--help` is still
broken only printing the flag information.

Fix go mod #3

Fix go mod #3

Fix go mod #2

Add Credits