build(deps): bump github.com/juju/schema

Bumps [github.com/juju/schema](https://github.com/juju/schema) from 1.0.1-0.20190814234152-1f8aaeef0989 to 1.2.0.
- [Release notes](https://github.com/juju/schema/releases)
- [Commits](https://github.com/juju/schema/commits/v1.2.0)

---
updated-dependencies:
- dependency-name: github.com/juju/schema
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -28,7 +28,7 @@ require (
 	github.com/jochenvg/go-udev v0.0.0-20171110120927-d6b62d56d37b
 	github.com/juju/gomaasapi v0.0.0-20200602032615-aa561369c767
 	github.com/juju/persistent-cookiejar v0.0.0-20171026135701-d5e5a8405ef9
-	github.com/juju/schema v1.0.1-0.20190814234152-1f8aaeef0989
+	github.com/juju/schema v1.2.0
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51
 	github.com/mattn/go-colorable v0.1.12
 	github.com/mattn/go-sqlite3 v1.14.12

go.sum

@@ -498,8 +498,9 @@ github.com/juju/retry v0.0.0-20160928201858-1998d01ba1c3/go.mod h1:OohPQGsr4pnxw
 github.com/juju/retry v0.0.0-20180821225755-9058e192b216 h1:/eQL7EJQKFHByJe3DeE8Z36yqManj9UY5zppDoQi4FU=
 github.com/juju/retry v0.0.0-20180821225755-9058e192b216/go.mod h1:OohPQGsr4pnxwD5YljhQ+TZnuVRYpa5irjugL1Yuif4=
 github.com/juju/schema v1.0.0/go.mod h1:Y+ThzXpUJ0E7NYYocAbuvJ7vTivXfrof/IfRPq/0abI=
-github.com/juju/schema v1.0.1-0.20190814234152-1f8aaeef0989 h1:qx1Zh1bnHHVIMmRxq0fehYk7npCG50GhUwEkYeUg/t4=
 github.com/juju/schema v1.0.1-0.20190814234152-1f8aaeef0989/go.mod h1:Y+ThzXpUJ0E7NYYocAbuvJ7vTivXfrof/IfRPq/0abI=
+github.com/juju/schema v1.2.0 h1:+XywM0pYzuhGebQiK1aR4Bj7Q7nLV5MihcOgq6dLLxs=
+github.com/juju/schema v1.2.0/go.mod h1:VdljuJLc45loM79LYm4yKKmPJwK1bPKRekvMVlfywU0=
 github.com/juju/simplekv v0.0.0-20180621131307-362a422e1a65/go.mod h1:eWPdApRHN/6DFoA1oVogxdFv+buyFOcPX+2o02pf8hI=
 github.com/juju/simplekv v1.0.0 h1:hBI0J4MeefwfpT8evAmzelFhzJGoZEzOwz7lJzaPpcw=
 github.com/juju/simplekv v1.0.0/go.mod h1:W6kIw37KHOcLIAn02qXi0SWkvS9pobEYKLWFuCsL2F0=