D13714: Fix broken url to API specification

[Ralf Habacker]

habacker created this revision.
Restricted Application added a project: Frameworks.
Restricted Application added a subscriber: kde-frameworks-devel.
habacker requested review of this revision.

TEST PLAN
  checked link in browser

REPOSITORY
  R235 Attica

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D13714

AFFECTED FILES
  README.md

To: habacker
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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