Try using latest deploy plugin.
See if that avoids the problem with deploying to bintray... sigh.
<artifactId>maven-source-plugin</artifactId>
<version>3.0.1</version>
</plugin>
+
+ <plugin>
+ <groupId>org.apache.maven.plugins</groupId>
+ <artifactId>maven-deploy-plugin</artifactId>
+ <version>3.0.0-M1</version>
+ </plugin>
</plugins>
</pluginManagement>
</build>
