Update go jose

[maraino]

Description

This PR adapts certificates code to [email protected], claims iat, nbf, and exp are now pointers instead of values.

This PR won't be merged until square/go-jose#224 gets merged. Instead of waiting for the merge we are using our fork.

Related to smallstep/cli#105

[codecov-io]

Codecov Report

Merging #59 into master will decrease coverage by 15.2%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           master      #59       +/-   ##
===========================================
- Coverage   78.33%   63.12%   -15.21%     
===========================================
  Files          29       32        +3     
  Lines        2109     2644      +535     
===========================================
+ Hits         1652     1669       +17     
- Misses        337      854      +517     
- Partials      120      121        +1

Impacted Files	Coverage Δ
authority/authorize.go	75% <0%> (ø)	⬆️
autocert/controller/client.go	0% <0%> (ø)
autocert/controller/main.go	4.38% <0%> (ø)
autocert/controller/provisioner.go	0% <0%> (ø)

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[dopey]

lgtm. just remember to revert cli branch in Gopkg.toml