Bump nltk from 3.6.2 to 3.6.6 in /nlaugmenter/transformations/synonym_substitution#1

dependabot[bot] wants to merge 2 commits intomainamazon-science/recode:mainfrom

dependabot/pip/nlaugmenter/transformations/synonym_substitution/nltk-3.6.6amazon-science/recode:dependabot/pip/nlaugmenter/transformations/synonym_substitution/nltk-3.6.6Copy head branch name to clipboard