Merge pull request #644 from kyonRay/master

<build>(project): upgrade java sdk version.

Author: kyonRay

build.gradle

@@ -34,7 +34,7 @@ ext {
 // integrationTest.mustRunAfter test
 allprojects {
     group = 'org.fisco-bcos.java-sdk'
-    version = '3.0.0-SNAPSHOT'
+    version = '3.0.0'
     apply plugin: 'maven-publish'
     apply plugin: 'idea'
     apply plugin: 'eclipse'