fix path of require for memory-data-store in legacy-rtm
fix path of require for memory-data-store in legacy-rtm

slackapi/node-slack-sdk,peernohell/node-slack-client,slackhq/node-slack-client,slackapi/node-slack-sdk,slackhq/node-slack-sdk,slackapi/node-slack-sdk,slackapi/node-slack-sdk,peernohell/node-slack-client