remove Polyester

[Moelf]

closes #133

[Moelf]

this breaks @batch working on enumerate() but notice:

julia> @batch for (i,a) in enumerate(1:10)
       end
ERROR: MethodError: no method matching step(::Base.Iterators.Enumerate{ArrayInterface.OptionallyStaticUnitRange{Static.StaticInt{1}, Static.StaticInt{10}}})
Closest candidates are:
  step(::StepRange) at range.jl:633
  step(::LinRange) at range.jl:637
  step(::StepRangeLen{T, Base.TwicePrecision{T}, Base.TwicePrecision{T}}) where T<:AbstractFloat at twiceprecision.jl:442
  ...
Stacktrace:
 [1] maybe_static

so I would say let it be, @threads works on them already, and also @batch still works on just LazyTree because it's just an array

[codecov]

Codecov Report

Merging #134 (63eece6) into master (dbeca02) will decrease coverage by 0.09%.
The diff coverage is 50.00%.

❗ Current head 63eece6 differs from pull request most recent head 75f3cef. Consider uploading reports for the commit 75f3cef to get more accurate results

@@            Coverage Diff             @@
##           master     #134      +/-   ##
==========================================
- Coverage   92.32%   92.23%   -0.10%     
==========================================
  Files          11       10       -1     
  Lines        1447     1442       -5     
==========================================
- Hits         1336     1330       -6     
- Misses        111      112       +1     

Impacted Files	Coverage Δ
src/UnROOT.jl	100.00% <ø> (ø)
src/iteration.jl	88.76% <50.00%> (-0.51%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update dbeca02...75f3cef. Read the comment docs.