Prepare release 1.3.0

Bump the version out of its development suffix, turn the dev NEWS
heading into the 1.3.0 release heading and record the new
imputation-flag, verbose-reporting and duplicate-warning entries, and
add cran-comments for the release. Label the previously unlabelled
cran-comments section 1.2.1.

Also record the KorAPConnection() documentation fix of the preceding
commit in NEWS.md and explain it in cran-comments.md: the first 1.3.0
submission was rejected by the incoming pretest with the "Rd files
without \usage" NOTE on r-devel-linux-x86_64-debian-gcc and -clang.

R CMD check --as-cran Status OK (0 errors, 0 warnings, 0 notes) locally
on Fedora 44 with R 4.6.1, including the Rd fix. The macOS builder and
win-builder runs listed in cran-comments.md were made for the first
1.3.0 submission and are to be repeated before resubmitting.

The last state without the Rd fix was confirmed green on GitHub Actions
(https://github.com/KorAP/RKorAPClient/actions/runs/33394690107):
R-CMD-check passing on ubuntu-latest (devel, release, oldrel-1),
macOS-latest (release) and windows-latest (release), plus test-coverage
passing.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Change-Id: I87fb5ec5c587fa5d947a0d2d3b3c9af1a4c221cb
diff --git a/DESCRIPTION b/DESCRIPTION
index 1f64959..839de68 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: RKorAPClient
 Type: Package
 Title: 'KorAP' Web Service Client Package
-Version: 1.2.1.9000
+Version: 1.3.0
 Authors@R:
     c(person(given = "Marc",
              family = "Kupietz",