Bump master branch to version 3.0.0

Change-Id: I42b1b9122dfc713ba64e17b7dc79ea3ede45abe0
Issue-ID: INT-504
Signed-off-by: Gary Wu <gary.i.wu@huawei.com>
diff --git a/version-manifest/pom.xml b/version-manifest/pom.xml
index 89fb1b1..2b97228 100644
--- a/version-manifest/pom.xml
+++ b/version-manifest/pom.xml
@@ -8,7 +8,7 @@
   </parent>
   <groupId>org.onap.integration</groupId>
   <artifactId>version-manifest</artifactId>
-  <version>2.0.0-SNAPSHOT</version>
+  <version>3.0.0-SNAPSHOT</version>
   <packaging>maven-plugin</packaging>
   <name>ONAP Version Manifest and Maven Plugin</name>
   <url>https://www.onap.org</url>
diff --git a/version.properties b/version.properties
index af0373d..ddc6dd8 100644
--- a/version.properties
+++ b/version.properties
@@ -3,7 +3,7 @@
 # Note that these variables cannot be structured (e.g. : version.release or version.snapshot etc... )
 # because they are used in Jenkins, whose plug-in doesn't support
 
-major_version=2
+major_version=3
 minor_version=0
 patch_version=0