[CI] Add downgrade checks #22

Job	Run time
generate-matrix	2m 7s
test (Dict("ForwardDiff" => "=0.10.24"))	3m 51s
test (Dict("Cubature" => "=1.5.1"))	7m 23s
test (Dict("Distributions" => "=0.25.36"))	1m 22s
test (Dict("LogExpFunctions" => "=0.3.2"))	3m 56s
test (Dict("MvNormalCDF" => "=0.2.0"))	3m 48s
test (Dict("PrecompileTools" => "=1.0.0"))	3m 50s
test (Dict("Roots" => "=1.0.0"))	3m 47s
test (Dict("Combinatorics" => "=1.0.0"))	3m 55s
test (Dict("StatsBase" => "=0.33.7"))	3m 42s
test (Dict("WilliamsonTransforms" => "=0.1.0"))	3m 43s
test (Dict("StatsFuns" => "=0.9.14"))	1m 26s
test (Dict("QuadGK" => "=2.0.0"))	4m 6s
test (Dict("TaylorSeries" => "=0.12.0"))	2m 2s
test (Dict("SpecialFunctions" => "=2.0.0"))	3m 40s
test (Dict("ForwardDiff" => "=0.10.36"))	3m 47s
test (Dict("Cubature" => "=1.5.1"))	3m 51s
test (Dict("Distributions" => "=0.25.111"))	3m 49s
test (Dict("LogExpFunctions" => "=0.3.28"))	3m 57s
test (Dict("MvNormalCDF" => "=0.3.2"))	3m 43s
test (Dict("PrecompileTools" => "=1.2.1"))	3m 57s
test (Dict("Roots" => "=2.2.1"))	3m 54s
test (Dict("Combinatorics" => "=1.0.2"))	3m 44s
test (Dict("StatsBase" => "=0.34.3"))	3m 43s
test (Dict("WilliamsonTransforms" => "=0.1.5"))	3m 46s
test (Dict("StatsFuns" => "=1.3.2"))	4m 6s
test (Dict("QuadGK" => "=2.11.1"))	3m 58s
test (Dict("TaylorSeries" => "=0.17.8"))	3m 43s
test (Dict("SpecialFunctions" => "=2.4.0"))	3m 42s
	1h 46m 18s

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