update mvnrepository link

Author: Fadelis

.github/workflows/release_pipeline.yml

@@ -63,6 +63,7 @@ jobs:
           export GITHUB_TAG=${GITHUB_REF##*/}
           export NEW_SNAPSHOT_VERSION=${GITHUB_TAG%%${GITHUB_TAG##*[!0-9]}}$((${GITHUB_TAG##*[!0-9]} + 1))-SNAPSHOT
           sed -i "s/<version>[0-9.]*<\/version>/<version>$GITHUB_TAG<\/version>/" README.md
+          sed -i "s/protoc-gen-java-optional\/[0-9.]+)/protoc-gen-java-optional\/$GITHUB_TAG)/" README.md
           mvn versions:set -DgenerateBackupPoms=false -DnewVersion=$NEW_SNAPSHOT_VERSION
 
       - name: Commit snapshot version bump

README.md

@@ -10,7 +10,7 @@ keyword.
 
 You must have `protoc` binary installed in your system and have to download `protoc-gen-java-optional` executable based on
 platform from GitHub [releases](https://github.com/Fadelis/protoc-gen-java-optional/releases)
-or [maven-central]().
+or at `Files` section in [maven-central](https://mvnrepository.com/artifact/org.grpcmock/protoc-gen-java-optional/1.0.0).
 
 With defaults: