Update to 1.01
Add missing DEPENDS.

Upstream changes:
1.01
15 Aug 2017
- Move Math::Utils dependancy from 1.06 to 1.10. A test
  was failing in 21-secondd.t because the older version's
  pl_evaluate() wasn't handling lists back then.
1.00
9 Aug 2017
- Add tests, more POD clean-up, send to CPAN.
18 Jul 2017
- Add references for the central and forward difference
  methods.
- Have not been able to find a reference for the second
  derivative difference method, annoyingly.
- Minimum perl version set to 5.10.1.
17 Jul 2017
- Added a forward difference approximation method (bug was filed
  for this as user Maitraya Baliyan was expecting it instead of
  the central difference approximation method that Derivative1()
  used).
- Added names forwarddiff() and centraldiff() for export.
  Derivative1() is aliased to centraldiff(), so as not to break
  old code.
- Likewise, seconddx() is now the exported name of the second
  derivative difference method, with Derivative2() aliased to it.
- There is now an EXPORT tag, ':all'.
- POD is more descriptive, has more examples, and uses the
  new names.

(wen)