Pin pymapd version to 0.7.1 (#3543)
Pin pymapd version to 0.7.1 (#3543)

Newer versions dropped support for Python 2. Closes #3542.
getredash/redash,denisov-vlad/redash,getredash/redash,alexanderlz/redash,denisov-vlad/redash,alexanderlz/redash,alexanderlz/redash,denisov-vlad/redash,getredash/redash,alexanderlz/redash,getredash/redash,denisov-vlad/redash,getredash/redash,denisov-vlad/redash