Bump okhttp from 3.12.1 to 3.14.2 in /core

[dependabot-preview]

Bumps okhttp from 3.12.1 to 3.14.2.

Changelog

Sourced from okhttp's changelog.

Version 3.14.2

2019-05-19

• Fix: Lock in a route when recovering from an HTTP/2 connection error. We had a bug where two
  calls that failed at the same time could cause OkHttp to crash with a NoSuchElementException
  instead of the expected IOException.

• Fix: Don't crash with a NullPointerException when formatting an error message describing a
  truncated response from an HTTPS proxy.

Version 4.0.0-ALPHA01

2019-05-08

This is an unstable preview of the OkHttp 4 release. It should not be used.

Version 3.12.3

2019-05-07

• Fix: Permit multipart file names to contain non-ASCII characters.
• Fix: Retain the Route when a connection is reused on a redirect or other follow-up. This was
  causing some Authenticator calls to see a null route when non-null was expected.

Version 3.14.1

2019-04-10

• Fix: Don't crash when an interceptor retries when there are no more routes. This was an
  edge-case regression introduced with the events cleanup in 3.14.0.

• Fix: Provide actionable advice when the exchange is non-null. Prior to 3.14, OkHttp would
  silently leak connections when an interceptor retries without closing the response body. With
  3.14 we detect this problem but the exception was not helpful.

Version 3.14.0

2019-03-14

• This release deletes the long-deprecated OkUrlFactory and OkApacheClient APIs. These
  facades hide OkHttp's implementation behind another client's API. If you still need this please
  copy and paste [ObsoleteUrlFactory.java][obsolete_url_factory] or
  [ObsoleteApacheClient.java][obsolete_apache_client] into your project.

• OkHttp now supports duplex calls over HTTP/2. With normal HTTP calls the request must finish
  before the response starts. With duplex, request and response bodies are transmitted

... (truncated)

Commits

• b8b6ee8 [maven-release-plugin] prepare release parent-3.14.2
• d1c4b1e Merge pull request #5068 from square/jwilson.0518.lock_in_route_
• 5ecec36 Lock in a route in hasRouteToTry() (3.14.x branch)
• ebe5c60 Reproduce NoSuchElementException in RouteSelector.next() in a test
• 3ec8537 Merge pull request #4976 from yschimke/another_branch_fix
• 5d8316b Testing branch fix
• baa96c2 Fix 3.14 snapshot builds in Travis after release (#4926)
• b2c85ba Merge pull request #4936 from TangHuaiZhe/dev2
• 0db2005 Fix #4915 nullPointerException caused by realConnection is null
• a4c0599 Ignore dependency:resolve failure on 3.14 branch (#4924)
• Additional commits viewable in compare view

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[rnorth]

Will test this on a Mac for extra test coverage. @bsideup do you think you could run this on Windows CI?

[rnorth]

LGTM on Mac OS X.

[bsideup]

@rnorth I will run the tests on Windows once I stabilize the Azure Pipelines