Upgrade guava to 20.0

[lukasniemeier-zalando]

This upgrades the guava dependency to the latest Java 7 compatible version, allowing the usage of recent guava libraries in projects using docker-client. The version currently used (18.0) is 3 years old.

After merge docker-client needs guava >= 20.0, see here.

Further upgrades depend on #756 😉

[lukasniemeier-zalando]

Build is only failing for docker 1.10.3, but seems to be the case for all builds.

[codecov-io]

Codecov Report

Merging #792 into master will not change coverage.
The diff coverage is 50%.

@@            Coverage Diff            @@
##             master     #792   +/-   ##
=========================================
  Coverage     66.46%   66.46%           
  Complexity      745      745           
=========================================
  Files           166      166           
  Lines          3140     3140           
  Branches        357      357           
=========================================
  Hits           2087     2087           
  Misses          898      898           
  Partials        155      155

[davidxia]

@mattnworb?

[mattnworb]

Thanks for the PR! One minor thing: would you mind updating the CHANGELOG too?

@davidxia : I'd like if we can merge this after #850 is done, to combine these two changes

[lukasniemeier-zalando]

One minor thing: would you mind updating the CHANGELOG too?

@mattnworb done.

[davidxia]

I rebased on master here #860

[mattnworb]

Thanks @davidxia

@lukasniemeier-zalando the merge conflict is because the CHANGELOG file on master at the time of your edit was out of date and still referred to 8.8.1 as the "not yet released" version even though 8.8.3 had been released. Thanks again for the PR!