[pom] Upgrade proguard-maven-plugin to 2.0.13
[pom] Upgrade proguard-maven-plugin to 2.0.13

revelc/formatter-maven-plugin,hazendaz/formatter-maven-plugin,revelc/formatter-maven-plugin,revelc/formatter-maven-plugin,ctubbsii/formatter-maven-plugin,hazendaz/formatter-maven-plugin,hazendaz/formatter-maven-plugin,ctubbsii/formatter-maven-plugin,revelc/formatter-maven-plugin,hazendaz/formatter-maven-plugin,ctubbsii/formatter-maven-plugin,ctubbsii/formatter-maven-plugin