Prep for v1.0

[odow]

Part of jump-dev/JuMP.jl#2564

[codecov]

Codecov Report

Merging #301 (62f5339) into master (a6b0deb) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #301      +/-   ##
==========================================
+ Coverage   88.00%   88.05%   +0.05%     
==========================================
  Files           2        3       +1     
  Lines         675      678       +3     
==========================================
+ Hits          594      597       +3     
  Misses         81       81              

Impacted Files	Coverage Δ
src/Ipopt.jl	100.00% <100.00%> (ø)

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