Typo in README.md

[cvigoe]

"There are a few conditions that the theory says are important, like the step size MUCH decrease with each iteration. For now, who cares! It works."

Should be

"There are a few conditions that the theory says are important, like the step size MUST decrease with each iteration. For now, who cares! It works."

Capitalization added to highlight typo

[jostmey]

Thanks