CI code coverage upload needs fixing

[alon-e]

Bug description

Jacoco results fail to upload.

Hardware Spec

travis :)

Steps To Reproduce

just look at the Travis push builds.

Expected behaviour

coverage uploads

Actual behaviour

premature failure due to download issues.

Errors

https://travis-ci.org/iotaledger/iri/jobs/441689304#L1874

test $TRAVIS_PULL_REQUEST = "false" && test $TRAVIS_JDK_VERSION = "oraclejdk8" && wget -O codacy-coverage-reporter-assembly-latest.jar $(curl https://api.github.com/repos/codacy/codacy-coverage-reporter/releases/latest | jq -r .assets[0].browser_download_url)
--2018-10-15 14:32:11--  http://null/

this is due to bad jq parsing:
working command:

test $TRAVIS_PULL_REQUEST = "false" && test $TRAVIS_JDK_VERSION = "oraclejdk8" && wget -O codacy-coverage-reporter-assembly-latest.jar $(curl https://api.github.com/repos/codacy/codacy-coverage-reporter/releases/latest | jq -r '.assets[0].browser_download_url')

(notice the '...')

[alon-e]

codacy/codacy-coverage-reporter#103