Add mutating sequence

[heltonmc]

Closes #59

Need to go through and test benchmarks to make sure there are no regressions and need to add methods for all the other Bessel functions. Always amazed how expensive allocating memory is...

julia> @benchmark Bessels.besselj!(x, 1:10, 1.0) setup=(x=zeros(Float64, 10))
BenchmarkTools.Trial: 10000 samples with 741 evaluations.
 Range (min … max):  169.345 ns … 328.243 ns  ┊ GC (min … max): 0.00% … 0.00%
 Time  (median):     173.259 ns               ┊ GC (median):    0.00%
 Time  (mean ± σ):   174.458 ns ±  11.158 ns  ┊ GC (mean ± σ):  0.00% ± 0.00%

        ▁██▃  ▂▂▁                                               ▂
  ▄▃▅▇▆▆████▆████▇▆▅▅▄▅▅▅▅▁▃▃▄▅▄▃▄▁▄▃▃▁▃▄▃▁▁▁▅▃▄▃▃▄▁▃▄▃▄▁▄▄▄▅▆▅ █
  169 ns        Histogram: log(frequency) by time        199 ns <

 Memory estimate: 0 bytes, allocs estimate: 0.

julia> @benchmark Bessels.besselj(1:10, 1.0) setup=(x=zeros(Float64, 10))
BenchmarkTools.Trial: 10000 samples with 585 evaluations.
 Range (min … max):  203.162 ns …  1.300 μs  ┊ GC (min … max): 0.00% … 74.22%
 Time  (median):     204.342 ns              ┊ GC (median):    0.00%
 Time  (mean ± σ):   211.169 ns ± 39.150 ns  ┊ GC (mean ± σ):  0.66% ±  3.32%

  █▁▂▁                   ▁▂▁ ▁                                 ▁
  ████▆▅▆▄▄▄▃▆▄▄▄▄▄▅▄▃▃▄▇██████▆▅▄▄▃▁▄▃▄▃▅▅▄▄▄▄▄▅▆▄▆▆▅▄▄▅▆▆▆▄▅ █
  203 ns        Histogram: log(frequency) by time       319 ns <

 Memory estimate: 144 bytes, allocs estimate: 1.

I guess we also need to decide if we want to export the new methods.... probably require v0.3.0 release...

[codecov]

Codecov Report

Base: 94.70% // Head: 94.72% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (08d3600) compared to base (6c8be6f).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 08d3600 differs from pull request most recent head e1241a4. Consider uploading reports for the commit e1241a4 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #60      +/-   ##
==========================================
+ Coverage   94.70%   94.72%   +0.01%     
==========================================
  Files          18       18              
  Lines        1964     1970       +6     
==========================================
+ Hits         1860     1866       +6     
  Misses        104      104              

Impacted Files	Coverage Δ
src/besseli.jl	98.10% <100.00%> (+0.01%)	⬆️
src/besselj.jl	93.08% <100.00%> (+0.07%)	⬆️
src/besselk.jl	97.28% <100.00%> (+0.02%)	⬆️
src/bessely.jl	91.66% <100.00%> (+0.07%)	⬆️
src/sphericalbessel.jl	100.00% <0.00%> (ø)

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[heltonmc]

Ok I've added all the methods for besselj!, bessely!, besselk!, and besseli!. There was also a bad allocation in the modified Bessel functions that I cleaned up where they now all don't allocate.

I'm not for sure how I feel about exporting all these different types of methods. If we do we should probably also export sphericalbesseli and sphericalbesselk in next big release.... but IDK.