Release 3.8.11-3

Bump local version 3.8.11-2 -> 3.8.11-3 for the whitespace-form token
crash fix. Update the -V version string (docker-entrypoint.sh), the
example output in README.md, and promote the CHANGELOG [Unreleased]
section to [3.8.11-3].

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Change-Id: Iceaf8955955c1394bcc32a9baa6fa78de496ce87
diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index e2c972b..60ab860 100755
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -62,7 +62,7 @@
             ;;
         V)
             echo "=== Version Information ===" >&2
-            echo "conllu-spacy-docker version: 3.8.11-2" >&2
+            echo "conllu-spacy-docker version: 3.8.11-3" >&2
             python -c "import spacy; print(f'spaCy version: {spacy.__version__}')" >&2
 
             # Check for GermaLemma