Make tag parsing lowercased
Make tag parsing lowercased

FujiMakoto/makoto-rivescript,Dinh-Hung-Tu/rivescript-python,Dinh-Hung-Tu/rivescript-python,plasmashadow/rivescript-python,FujiMakoto/makoto-rivescript,aichaos/rivescript-python,plasmashadow/rivescript-python,Dinh-Hung-Tu/rivescript-python,aichaos/rivescript-python,plasmashadow/rivescript-python,FujiMakoto/makoto-rivescript,aichaos/rivescript-python