learning circles

coordinate study groups for online courses

Bump acorn from 6.1.1 to 6.4.1 Bumps [acorn](https://github.com/acornjs/acorn) from 6.1.1 to 6.4.1. - [Release notes](https://github.com/acornjs/acorn/releases) - [Commits](https://github.com/acornjs/acorn/compare/6.1.1...6.4.1) Signed-off-by: dependabot[bot]

Bump bleach from 3.1.1 to 3.1.4 Bumps [bleach](https://github.com/mozilla/bleach) from 3.1.1 to 3.1.4. - [Release notes](https://github.com/mozilla/bleach/releases) - [Changelog](https://github.com/mozilla/bleach/blob/master/CHANGES) - [Commits](https://github.com/mozilla/bleach/compare/v3.1.1...v3.1.4) Signed-off-by: dependabot[bot]

Bump bleach from 3.1.1 to 3.1.4 Bumps [bleach](https://github.com/mozilla/bleach) from 3.1.1 to 3.1.4. - [Release notes](https://github.com/mozilla/bleach/releases) - [Changelog](https://github.com/mozilla/bleach/blob/master/CHANGES) - [Commits](https://github.com/mozilla/bleach/compare/v3.1.1...v3.1.4) Signed-off-by: dependabot[bot]

Bump bleach from 3.1.1 to 3.1.2 Bumps [bleach](https://github.com/mozilla/bleach) from 3.1.1 to 3.1.2. - [Release notes](https://github.com/mozilla/bleach/releases) - [Changelog](https://github.com/mozilla/bleach/blob/master/CHANGES) - [Commits](https://github.com/mozilla/bleach/compare/v3.1.1...v3.1.2) Signed-off-by: dependabot[bot]

Bump acorn from 6.1.1 to 6.4.1 Bumps [acorn](https://github.com/acornjs/acorn) from 6.1.1 to 6.4.1. - [Release notes](https://github.com/acornjs/acorn/releases) - [Commits](https://github.com/acornjs/acorn/compare/6.1.1...6.4.1) Signed-off-by: dependabot[bot]

Update bytestring changes for code lifted from django to do email validation