updated installation instructions for Docker
updated installation instructions for Docker

deanmalmgren/textract,lucadealfaro/textract,scalp42/textract,jpadilla/textract,Nift/textract,jpadilla/textract,jpadilla/textract,lucadealfaro/textract,Nift/textract,deanmalmgren/textract,lucadealfaro/textract,scalp42/textract,Nift/textract,deanmalmgren/textract,scalp42/textract