Add Gitter badge (#976)
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chengren311/azkaban,azkaban/azkaban,reallocf/azkaban,azkaban/azkaban,jackrjli/azkaban,erwa/azkaban,reallocf/azkaban,HappyRay/azkaban,jackrjli/azkaban,erwa/azkaban,reallocf/azkaban,chengren311/azkaban,jackrjli/azkaban,azkaban/azkaban,HappyRay/azkaban,HappyRay/azkaban,chengren311/azkaban,sunghyuk/azkaban,sunghyuk/azkaban,reallocf/azkaban,azkaban/azkaban,jackrjli/azkaban,erwa/azkaban,sunghyuk/azkaban,erwa/azkaban,jackrjli/azkaban,HappyRay/azkaban,HappyRay/azkaban,azkaban/azkaban,sunghyuk/azkaban,sunghyuk/azkaban,reallocf/azkaban,HappyRay/azkaban,chengren311/azkaban,chengren311/azkaban,erwa/azkaban,azkaban/azkaban