Bump working version to 2.0.0-alpha.
Bump working version to 2.0.0-alpha.

aaemnnosttv/wp-cli,GaryJones/wp-cli,trepmal/wp-cli,trepmal/wp-cli,GaryJones/wp-cli,aaemnnosttv/wp-cli,aaemnnosttv/wp-cli,2ndkauboy/wp-cli,2ndkauboy/wp-cli,rodrigoprimo/wp-cli,GaryJones/wp-cli,2ndkauboy/wp-cli,trepmal/wp-cli,rodrigoprimo/wp-cli,rodrigoprimo/wp-cli