bump to version 0.4.0b
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bgruening/gemini,xuzetan/gemini,heuermh/gemini,xuzetan/gemini,bpow/gemini,brentp/gemini,brentp/gemini,brentp/gemini,arq5x/gemini,udp3f/gemini,udp3f/gemini,brentp/gemini,udp3f/gemini,bpow/gemini,bgruening/gemini,bw2/gemini,bw2/gemini,udp3f/gemini,arq5x/gemini,heuermh/gemini,bgruening/gemini,bw2/gemini,xuzetan/gemini,heuermh/gemini,arq5x/gemini,bpow/gemini,bw2/gemini,xuzetan/gemini,bgruening/gemini,bpow/gemini,heuermh/gemini,arq5x/gemini