add ignore args, just to ignore some .swp files

[ThomasLau]

hey, guy, the plugin will run a watchtarget task when i use VIM to edit some file, so add a ignores args, just to ignore these files.

watch {
    java {
        files files('src/main/java')
        tasks 'compileJava'
        ignores '.*\\.swp'
    }
}