Minor typo in readme

[thecodewarrior]

I just noticed a typo in the readme and thought I'd point it out as opposed to assuming "someone else will do it."

Under Transformation and Archiving you have substrict where you likely meant subscript.

[phimage]

thanks @thecodewarrior do not hesitate to make a PR. You can edit readme on github and submit your modification

[jyounus]

I went ahead and created a PR for this: #18