Allow editing url and thumbnail_url for non-local image in update_opt API

[codeclimate[bot]]

Code Climate has analyzed commit 3c006941 and detected 0 issues on this pull request.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 79.25%. Comparing base (ae19d8a) to head (3c00694).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #34 +/- ## ========================================== + Coverage 79.01% 79.25% +0.24% ========================================== Files 29 29 Lines 1253 1263 +10 ========================================== + Hits 990 1001 +11 + Misses 263 262 -1 ```

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