Deprecation fixes and drop 0.4/0.5

Merge pull request #25 from mlubin/fbot/deps

Run femtocleaner

v0.2.6: Merge pull request #22 from anowacki/an/bugfix-extrema

Fix bug in `extrema`

v0.2.5: Compatibility with multi-dimensional arrays; closes #19 (#20)

* Compatibility with multi-dimensional arrays

* reinsert extrema

was removed by mistake

* replace size with length

v0.2.4: Merge pull request #15 from ararslan/aa/no-export

Avoid exporting vectorized functions with deprecation

v0.2.3: Merge pull request #14 from ararslan/aa/min-max

Add IEEE 754-2008 compliant min and max