message: change tag to is in MergeDetail
diff: @@ -17,10 +17,10 @@ const MergeDetail = ({state}) => {
  <CircleOcticon icon={Check} size={32} bg={stateColorMap[state]} color="white" />
  </Block>
  <Block p={2} display="inline">
  - <Text tag="p" p={0} m={0} fontSize={2} fontWeight="bold">
  + <Text is="p" p={0} m={0} fontSize={2} fontWeight="bold">
  This branch has no conflicts with the base branch
  </Text>
  - <Text tag="p" pt={1} m={0} fontSize={0}>
  + <Text is="p" pt={1} m={0} fontSize={0}>
  Merging can be performed automatically
  </Text>
  </Block>
  