bump major version for breaking changes

[jverzani]

Branch to accumulate breaking changes

• remove deprecations

• Bisection over non-FloatNN uses non-zero tolerances and bisection, not hacky A42 behind the scenes. Default over FloatNN uses zero tolerances and special code path for performance.

• adjust tolerances for bracketing methods, tweak convergence criteria to be more standard, less idiosyncratic

• drop some of the type hierarchy for bracketing (the Accelerated.., BisectionExact)

• regularize naming of abstract methods, e.g. AbstractBracketing -> AbstractBracketingMethod (no means to deprecate this?);

• make separate code path to solve default bisection over FloatNN (~ 10% faster)

• emphasize use of keyword (not positional argument) to pass parameter

• Create diversity in options type for dispatch remove unused maxfnevals from options;

• Instead ofassess_convergence depending on the method, include method calls within to depend on method and options types

• clean up docstrings abit

• adjust output of Tracks object a bit; keep track of "x,fx" and "a, b" so that hybrid methods can be tracked better; add some API to Tracks objects for users: empty!, last, get

• break up order0.jl into hybrid.jl (fixing logging bug) and order0

• use maxiters not maxevals, as it is more common throughout ecosystem, but still allowing maxevals. (Similar to atol is preferred, but abstol allowsed.)

[codecov]

Codecov Report

Merging #287 (251cb5f) into master (a9f675b) will increase coverage by 0.02%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master     #287      +/-   ##
==========================================
+ Coverage   84.74%   84.76%   +0.02%     
==========================================
  Files          34       32       -2     
  Lines        2097     2054      -43     
==========================================
- Hits         1777     1741      -36     
+ Misses        320      313       -7     

Impacted Files	Coverage Δ
src/Derivative/thukralb.jl	100.00% <ø> (ø)
src/Roots.jl	0.00% <ø> (ø)
src/utils.jl	73.62% <0.00%> (-0.54%)	⬇️
src/trace.jl	24.46% <5.12%> (-13.87%)	⬇️
src/Derivative/newton.jl	83.33% <33.33%> (-16.67%)	⬇️
src/Derivative/lith.jl	70.42% <75.00%> (-0.31%)	⬇️
src/state.jl	80.95% <80.00%> (+38.09%)	⬆️
src/DerivativeFree/order5.jl	56.36% <81.81%> (-0.16%)	⬇️
src/DerivativeFree/order8.jl	92.85% <85.71%> (+3.96%)	⬆️
src/Bracketing/alefeld_potra_shi.jl	85.63% <89.01%> (+3.64%)	⬆️
... and 22 more

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