Fix error in example/check

  > # Explore V-J-junction length groups sizes to use subsample
  > # Show the size of the largest groups
  > db %>%
  +     group_by(JUNCTION_LENGTH) %>%
  +     do(groupGenes(., first=TRUE)) %>%
  +     mutate(GROUP_ID=paste(JUNCTION_LENGTH,VJ_GROUP, sep="_")) %>%
  +     ungroup() %>%
  +     group_by(GROUP_ID) %>%
  +     distinct(JUNCTION) %>%
  +     summarize(SIZE=n()) %>%
  +     arrange(desc(SIZE)) %>%
  +     select(SIZE) %>%
  +     top_n(10)
  Error in db %>% group_by(JUNCTION_LENGTH) %>% do(groupGenes(., first = TRUE)) %>%  : 
    could not find function "%>%"
  Execution halted
  ** found \donttest examples: check also with --run-donttest

1 error ✖ | 0 warnings ✔ | 0 notes ✔
Error: R CMD check found ERRORs
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