Bump up Spock version to 2.2
Bump up Spock version to 2.2

jvm-bloggers#738

kraluk/jvm-bloggers,kraluk/jvm-bloggers,jvm-bloggers/jvm-bloggers,jvm-bloggers/jvm-bloggers,kraluk/jvm-bloggers,jvm-bloggers/jvm-bloggers,jvm-bloggers/jvm-bloggers,kraluk/jvm-bloggers