use Revise on pre-extension versions of Julia

remove weakdep from dep

compat bump

convert issue

[Diff since v4.0.4](v4.0.4...v4.0.5)

**Merged pull requests:**
- update Documenter version (#539) (@jverzani)
- adjust compat; check typos; readme (#540) (@jverzani)
- add compat bounds (#541) (@jverzani)

[Diff since v4.0.3](v4.0.3...v4.0.4)

**Merged pull requests:**
- Type-stable ChebyshevT multiplication (#537) (@jishnub)
- Throw DomainError for out-of-domain evaluation (#538) (@jishnub)

[Diff since v4.0.2](v4.0.2...v4.0.3)

**Merged pull requests:**
- Bump actions/checkout from 3 to 4 (#533) (@dependabot[bot])
- stupid piracy (#534) (@jverzani)
- Issue 533 piracy (#535) (@jverzani)
- Sparse vector polynomial (#536) (@jverzani)

[Diff since v4.0.1](v4.0.1...v4.0.2)

**Merged pull requests:**
- Issue 519 (#532) (@jverzani)

[Diff since v4.0.0](v4.0.0...v4.0.1)

**Closed issues:**
- bad type inference for composition of `ImmutablePolynomial`s (#512)
- polynomials should have `big` methods? (#522)

**Merged pull requests:**
- Point LICENSE to current contributors list (#521) (@vtjnash)
- fix some stray untyped global variables (#523) (@nsajko)
- don't use `Val` with `ntuple` when the length isn't a constant (#525) (@nsajko)
- no special case for `coeffs` (#528) (@jverzani)
- special case immutable poly powers (#529) (@jverzani)
- an algorithm for polynomial composition, an algorithm for FFT-based * (#530) (@jverzani)
- bump version (#531) (@jverzani)

[Diff since v3.2.13](v3.2.13...v4.0.0)

**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)