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This removes a circular dependency between projects.

Update module go.opencensus.io to v0.23.0

See merge request go-sso!21

Update golang.org/x/crypto commit hash to 5ea612d

See merge request go-sso!20

Update module go.opencensus.io to v0.22.6

See merge request go-sso!18

Update golang.org/x/crypto commit hash to b8e89b7

See merge request go-sso!19

Update module yaml to v2.4.0

See merge request go-sso!15

Update module oschwald/maxminddb-golang to v1

See merge request go-sso!16

Update module rs/cors to v1

See merge request go-sso!17

Update module mssola/user_agent to v0.5.2

See merge request go-sso!13

Update module oschwald/maxminddb-golang to v0.2.0

See merge request go-sso!14

Update module elazarl/go-bindata-assetfs to v1.0.1

See merge request go-sso!11

Update module gorilla/mux to v1.8.0

See merge request go-sso!12

Configure Renovate

See merge request go-sso!10

Fixes issue #16, the only change is in the u2f/otp login links.

Update the crewjam/saml library too.

Enforce group membership checks in the SAML server

See merge request go-sso!9

In this scenario there is no need to set 'users_file', instead we
introduce the new boolean attribute 'email_usernames'.