Alembic-migrate

- dependency updates ([commit](https://github.com/miguelgrinberg/flask-migrate/commit/5d61c191d7d8853f81e4fe71609b5ae315604c52))
- add pypy3 to test matrix ([commit](https://github.com/miguelgrinberg/flask-migrate/commit/1cc819e9f2a17435429c16531043d0a874f76288))

- suppress stack traces on command errors [204](https://github.com/miguelgrinberg/flask-migrate/issues/204) ([commit](https://github.com/miguelgrinberg/flask-migrate/commit/2dd45d0037cb62bc7a8a981f0de70071b891a2ff))
- Fix typo in docs [207](https://github.com/miguelgrinberg/flask-migrate/issues/207) ([commit](https://github.com/miguelgrinberg/flask-migrate/commit/817893fe16eb5361469af671c52d8276b69efeab)) (thanks **Grey Li**!)
- Update documentation link [206](https://github.com/miguelgrinberg/flask-migrate/issues/206) ([commit](https://github.com/miguelgrinberg/flask-migrate/commit/98374a6ac1006fe37ef6f09674ebaa094214ff3e)) (thanks **Grey Li**!)
- [182](https://github.com/miguelgrinberg/flask-migrate/issues/182): clear executable permission [183](https://github.com/miguelgrinberg/flask-migrate/issues/183) ([commit](https://github.com/miguelgrinberg/flask-migrate/commit/ee0b47ede1e88340c390fca9d0c27a9c8a7e3a9c)) (thanks **Christopher Yeleighton**!)

- Make directory as optional parameter ([commit](https://github.com/miguelgrinberg/flask-migrate/commit/7e6f511b050a023c9388868b97d7905b7571c16f)) (thanks **Diego Oliveira**!)
- Update CHANGELOG.md ([commit](https://github.com/miguelgrinberg/flask-migrate/commit/dcffe1e91f9f5cfc29c5cf5f285ef9a4169113bb))
- updated README.md to use flask cli in examples ([commit](https://github.com/miguelgrinberg/flask-migrate/commit/349826ef53f607fd5e866919f40b16315a2127cc))

- Remove the Flask-Script dependency in setup.py ([commit](https://github.com/miguelgrinberg/flask-migrate/commit/7bd5ef80016257ea56a1d10f917a361a13b6aad9))

- Change an Alembic doc link to http from https The SSL certificate is not valid for the alembic subdomain. ([commit](https://github.com/miguelgrinberg/flask-migrate/commit/00e8192f56f778939fd819a799a9b26010b46e2e)) (thanks **bovarysme**!)
- Update links pointing to the old Alembic doc [152](https://github.com/miguelgrinberg/flask-migrate/issues/152) ([commit](https://github.com/miguelgrinberg/flask-migrate/commit/81367408c46ecd96b2352f6e309dcb02dfc359e9)) (thanks **bovarysme**!)
- allow -x argument for migrate command [148](https://github.com/miguelgrinberg/flask-migrate/issues/148) ([commit](https://github.com/miguelgrinberg/flask-migrate/commit/3293d835811924822cf0e8d321760ddc482ea5f2)) (thanks **Tim Mundt**!)
- stop building python 2.6 ([commit](https://github.com/miguelgrinberg/flask-migrate/commit/5f34c5cd9610f2e3194672a350f57c55cb7edd25))

- remove py33 builds, add py36 ([commit](https://github.com/miguelgrinberg/flask-migrate/commit/c25ef622efc4dc28452124f56fc9bfa550ce858e))
- Support multiple -x arguments in Flask-Script interface [103](https://github.com/miguelgrinberg/flask-migrate/issues/103) ([commit](https://github.com/miguelgrinberg/flask-migrate/commit/d2947338d673041b6198b909a9f9381b73f6bf99))
- Fix autogenerate typos. ([commit](https://github.com/miguelgrinberg/flask-migrate/commit/19af3191d8245c110860f01bb48b02b0e2d9351a)) (thanks **Sorin Muntean**!)