Bump version to 0.2.2
Bump version to 0.2.2

Change-Id: I27e3344ae197a1473cd59363318ce1155bb4f925

jbeezley/pep257,bartvm/pep257,PyCQA/pydocstyle,jayvdb/pep257,pombredanne/pep257,glennmatthews/pep257,jmullan/pep257,codehs/pep257,GreenSteam/pep257,Nurdok/pep257,bagelbits/pep257,farmersez/pydocstyle,Nurdok/pydocstyle,tescalada/pydocstyle,13steinj/pep257