Switch from database/sql to sqlx

db/seed.sql

server/store/sqldb.go

server/store/store.go

server/store/store_test.go

server/store/types/string_slice.go

vendor/github.com/jmoiron/sqlx/LICENSE

vendor/github.com/jmoiron/sqlx/README.md

vendor/github.com/jmoiron/sqlx/bind.go

vendor/github.com/jmoiron/sqlx/doc.go

vendor/github.com/jmoiron/sqlx/named.go

vendor/github.com/jmoiron/sqlx/reflectx/README.md

vendor/github.com/jmoiron/sqlx/reflectx/reflect.go

vendor/github.com/jmoiron/sqlx/sqlx.go

vendor/vendor.json