v2.0.0

ARCHModels v2.0.0

Diff since v1.4.2

Closed issues:

• meanspect = Intercept() doesn't work? (#93)
• Use PreallocationTools.jl (#96)
• Multi-step predict for volatility (#97)

Merged pull requests:

• Predict (#98) (@s-broda)
• Updates for 1.7 (#99) (@s-broda)