update maven plugins

pom.xml

@@ -19,12 +19,12 @@
         <main.basedir>${basedir}</main.basedir>
         <spring-boot.version>1.3.5.RELEASE</spring-boot.version>
         <spring-cloud.version>Brixton.RELEASE</spring-cloud.version>
-        <build-plugin.jacoco.version>0.7.5.201505241946</build-plugin.jacoco.version>
-        <build-plugin.coveralls.version>4.0.0</build-plugin.coveralls.version>
+        <build-plugin.jacoco.version>0.7.7.201606060606</build-plugin.jacoco.version>
+        <build-plugin.coveralls.version>4.2.0</build-plugin.coveralls.version>
         <build-plugin.gpg.version>1.6</build-plugin.gpg.version>
-        <build-plugin.asciidoctor.version>1.5.2</build-plugin.asciidoctor.version>
+        <build-plugin.asciidoctor.version>1.5.3</build-plugin.asciidoctor.version>
         <build-plugin.exec.version>1.4.0</build-plugin.exec.version>
-        <build-plugin.git-commit-id.version>2.2.0</build-plugin.git-commit-id.version>
+        <build-plugin.git-commit-id.version>2.2.1</build-plugin.git-commit-id.version>
     </properties>
     <modules>
         <module>spring-boot-admin-server</module>