CHANGES IN VERSION 0.1.6
------------------------
 o treedata constructor <2017-12-20, Wed>
 o treedata show method now supports treedata@file contains several file names <2017-12-20, Wed>
 o optimize accessor of related nodes <2017-12-15, Fri>
   + https://github.com/GuangchuangYu/tidytree/issues/4
 o remove isTip column which can be computed easily and fixed typo in vignette <2017-12-15, Fri>

CHANGES IN VERSION 0.1.5
------------------------
 o show and get.fields methods for treedata <2017-12-14, Thu>

CHANGES IN VERSION 0.99.4
------------------------
 o for CRAN submission
   + Bioconductor team has complex of using S4 and force contributor to using it.
   + https://github.com/Bioconductor/Contributions/issues/578
 o move treedata class definition and some generic method from treeio to tidytree,
   since dependency of BioC devel pkg for a CRAN pkg seems not possible.
   Those code will remove from treeio and import from tidytree when it is accepted.

CHANGES IN VERSION 0.99.3
------------------------
 o valid.tbl_tree for checking tbl_tree object contains. <2017-12-13, Wed>

CHANGES IN VERSION 0.99.1
------------------------
 o add tests for groupOTU and groupClade <2017-12-12, Tue>

CHANGES IN VERSION 0.99.0
------------------------
 o fixed BiocCheck and ready to submit to Bioconductor <2017-12-12, Tue>

CHANGES IN VERSION 0.0.3
------------------------
 o update vignette with examples of groupOTU and groupClade <2017-12-12, Tue>
 o groupOTU & groupClade methods <2017-12-11, Mon>

CHANGES IN VERSION 0.0.2
------------------------
 o mrca method <2017-12-08, Fri>
 o access method for related nodes, including child, parent, offspring and ancestor <2017-12-07, Thu>
   + test added by @arendsee
 o remove fortify method, which should belong to ggtree <2017-12-07, Thu>
 o re-implement as.data.frame to as_data_frame <2017-12-07, Thu>

CHANGES IN VERSION 0.0.1
------------------------
 o as.data.frame & fortify method for treedata object <2016-12-06, Tue>