Add LICENSE
Upstream changes:
Release 1.06.
New 'mydist' Makefile target to sign and build a tarball.
Pass ABSTRACT, AUTHOR, LICENSE and MIN_PERL_VERSION to
ExtUtils::MakeMaker::WriteMakefile().
Correctly set $VERSION that doesn't trigger warnings:
https://rt.cpan.org/Ticket/Display.html?id=89020
Update documentation to include the URL to the project's new
source code repository at github.com:
https://github.com/blair/perl-math-interpolate
Update author contact email address.