Update for 1.0, follow CI scripts from NLSolversBase

[anriseth]

No description provided.

[pkofod]

Seems to be a problem with higherprecision?

[anriseth]

Yes, it has been deprecated in favour of DoubleFloats.jl, but that opened another can of worms. JuliaMath/DoubleFloats.jl#18 (default values set to Inf became NaN with DoubleFloats)

[codecov]

Codecov Report

Merging #129 into master will increase coverage by 3%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #129   +/-   ##
=======================================
+ Coverage   66.83%   69.84%   +3%     
=======================================
  Files           8        8           
  Lines         392      388    -4     
=======================================
+ Hits          262      271    +9     
+ Misses        130      117   -13

Impacted Files	Coverage Δ
src/backtracking.jl	85.18% <0%> (-1.03%)	⬇️
src/morethuente.jl	59.3% <0%> (+0.68%)	⬆️
src/initialguess.jl	89.47% <0%> (+2.46%)	⬆️
src/hagerzhang.jl	56.61% <0%> (+7.35%)	⬆️

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