CHANGES: draft the changelog for 0.3.0

CHANGES.md

@@ -1,6 +1,53 @@
 # Release notes
 
-## [v0.2.0](https://github.com/open2c/bioframe/compare/v0.1.0...HEAD)
+## [v0.3.0](https://github.com/open2c/bioframe/compare/v0.2.0...v0.3.0)
+
+Date : 2021-08-31
+
+Conceptual changes:
+* we formulated strict definitions for genomic intervals, dataframes, and 
+    their various properties. All bioframe functions are expected to follow
+    to these definitions tightly.  
+
+API changes:
+* reorganize modules: 
+    * ops - operations on genomic interval dataframes 
+    * extras - miscellaneous operations, most involving
+        genomic sequences and gene annotations
+    * vis - visualizations of genomic interval dataframes
+    * core.arrops - operations on genomic interval arrays
+    * core.checks - tests for definitions of genomic interval dataframes
+    * core.construction - construction and sanitation of genomic interval dataframes
+    * core.specs - specifications for the implementation of genomic intervals in pandas.dataframes 
+        (i.e. column names, datatypes, etc)
+    * core.stringops - operations on genomic interval strings
+    * io.fileops - I/O on common file formats for genomic data
+    * io.schemas - schemas for standard tabular formats for genomic data storage
+    * io.resources - interfaces to popular online genomic data resources 
+
+* new functions: extras.pair_by_distance, ops.sort_bedframe, ops.assign_view, 
+    dataframe constructors
+
+* existing functions:
+    * expand: take negative values and fractional values
+    * overlap: change default suffixes, keep_order=True
+    * subtract: add return_index and keep_order
+
+* enable pd.NA for missing values, typecasting
+
+New data:
+* add schemas for bedpe, gap, UCSCmRNA, pgsnp
+* add tables with curated detailed genome assembly information
+
+Bugfixes:
+* None?..
+
+Miscellaneous:
+* speed up frac_gc is faster now
+* drop support for Python 3.6, add support for 3.9
+
+
+## [v0.2.0](https://github.com/open2c/bioframe/compare/v0.1.0...v0.2.0)
 
 Date : 2020-12-02