get rid of maven centralsync plugin

Signed-off-by: Sergei Malafeev <sergeymalafeev@gmail.com>

pom.xml

@@ -145,16 +145,6 @@
           <tagNameFormat>@{project.version}</tagNameFormat>
         </configuration>
       </plugin>
-      <plugin>
-        <groupId>io.zipkin.centralsync-maven-plugin</groupId>
-        <artifactId>centralsync-maven-plugin</artifactId>
-        <version>0.1.1</version>
-        <configuration>
-          <subject>opentracing</subject>
-          <repo>maven</repo>
-          <packageName>opentracing-redis-client</packageName>
-        </configuration>
-      </plugin>
       <plugin>
         <groupId>com.mycila</groupId>
         <artifactId>license-maven-plugin</artifactId>

travis/publish.sh

@@ -118,11 +118,6 @@ if is_pull_request; then
 elif is_travis_branch_master; then
   ./mvnw --batch-mode -s ./.settings.xml -Prelease -nsu -q -DskipTests deploy
 
-  # If the deployment succeeded, sync it to Maven Central. Note: this needs to be done once per project, not module, hence -N
-  if is_release_commit; then
-    ./mvnw --batch-mode -s ./.settings.xml -nsu -q -N io.zipkin.centralsync-maven-plugin:centralsync-maven-plugin:sync
-  fi
-
 # If we are on a release tag, the following will update any version references and push a version tag for deployment.
 elif build_started_by_tag; then
   safe_checkout_master