Increment version to 0.4.2.
Increment version to 0.4.2.

asmedeus/djorm-ext-pgfulltext,ministryofjustice/djorm-ext-pgfulltext,linuxlewis/djorm-ext-pgfulltext,gsong/djorm-ext-pgfulltext,pombredanne/djorm-ext-pgfulltext,barseghyanartur/djorm-ext-pgfulltext,megahall/djorm-ext-pgfulltext