fix version from 1.2.0rc1 to 1.2.0-rc.1

After merge maybe copy and paste save time :) fix #1 and fix #2

    git tag -d 1.2.0rc1
    git push origin :refs/tags/1.2.0rc1
    git tag -d v1.2.0rc1
    git push origin :refs/tags/v1.2.0rc1
    git tag v1.2.0-rc.1
    git push tags