modify snapshot url
<property name="kopf.branch" value="fess-5.0" />
<!-- Maven Repository -->
- <property name="maven.snapshot.repo.url" value="https://oss.sonatype.org/content/repositories/releases" />
+ <property name="maven.snapshot.repo.url" value="https://oss.sonatype.org/content/repositories/snapshots" />
<property name="maven.release.repo.url" value="http://central.maven.org/maven2" />
<target name="install.plugins">
