v4.0.0

Polynomials v4.0.0

Diff since v3.2.13

Closed issues:

• Poly() not defined (#508)
• ImmutablePolynomial constructors seem to prevent good type inference (#510)
• Should AbstractPolynomial subtype Function? (#516)

Merged pull requests:

• minor type-inference improvements in roots (#505) (@jishnub)
• deprecated macro export, cf. issue #506 (#507) (@jverzani)
• Improve inference in derivative/integrate (#514) (@jishnub)
• fix sparse multiplication (#515) (@jverzani)
• decouple basis from storage type (#517) (@jverzani)
• Version bump (#518) (@jverzani)