v1.8.0

SimpleDiffEq v1.8.0

Diff since v1.7.0

Closed issues:

• Simple nlsolve (#50)
• Add new solvers and new features (#59)

Merged pull requests:

• Fix type instability in Tsit5 when using saveat (#60) (@utkarsh530)
• Fixes and Updates in SimpleEM (#61) (@utkarsh530)
• Additional GPU Compat ODE solvers (#62) (@utkarsh530)