Re-adding the oss-sonatype tag to the pom file so that releases can be performed.

git-svn-id: http://libphonenumber.googlecode.com/svn/trunk@693 ee073f10-1060-11df-b6a4-87a95322a99c
[maven-release-plugin] prepare release libphonenumber-6.2.2

git-svn-id: http://libphonenumber.googlecode.com/svn/trunk@694 ee073f10-1060-11df-b6a4-87a95322a99c
[maven-release-plugin] prepare for next development iteration

git-svn-id: http://libphonenumber.googlecode.com/svn/trunk@696 ee073f10-1060-11df-b6a4-87a95322a99c