Try and fix Travis deploy

We had weird errors about the URI gem not being at the right version:

> You have already activated uri 0.13.1, but your Gemfile requires uri
> 0.13.0. Since uri is a default gem, you can either remove your
> dependency on it or try updating to a newer version of bundler that
> supports uri as a default gem. (Gem::LoadError)

This is supposed to fix it for now.

https://travis-ci.community/t/deployments-are-failing-due-to-uri-dependency/14375/4

.travis.yml

@@ -38,6 +38,12 @@ notifications:
     on_success: never
     on_failure: always
 
+before_deploy:
+  - yes | gem update --system --force
+  - gem install bundler
+  - gem install uri
+  - gem install logger
+
 deploy:
   - provider: pages
     edge: true