prep 0.8.3 release

docs/modules/triangle.rst

@@ -510,6 +510,17 @@ As of version ``0.7.6``, four-dimensional slicing is supported:
   >>> clrd.iloc[[0, 10, 3], 1:8, :5, :]
   >>> clrd.loc[:'Aegis Grp', 'CumPaidLoss':, '1990':'1994', :48]
 
+As of version ``0.8.3``, ``.iat`` and ``at`` functionality have been added.  Similar
+to pandas, one can use these for value assignment for a single cell of a `Triangle`.
+When a 'sparse' backend is in use, these accessors are the only way to modify individual
+cells of a triangle.
+
+**Example:**
+  >>> import chainladder as cl
+  >>> raa = cl.load_sample('raa').set_backend('sparse')
+  >>> # To modify a sparse triangle, we need to use at or iat
+  >>> raa.at['Total', 'values', '1985', 12] = 10000
+
 
 
 Arithmetic

docs/releases.rst

@@ -4,6 +4,22 @@ Releases
 
 Version 0.8
 ===========
+Version 0.8.3
+--------------
+Release Date: Apr 25, 2021
+
+**Enhancements**
+
+- `#135 <https://github.com/casact/chainladder-python/issues/135>`__ - Added ``.at`` and ``.iat`` slicing and value assignment
+
+
+**Bug Fixes**
+
+- `#144 <https://github.com/casact/chainladder-python/issues/144>`__ - Eliminated error when trying to assign a column from a different array backend.
+- `#134 <https://github.com/casact/chainladder-python/issues/134>`__ - Clearer error handling when attempting to instantiate a triangle with ages instead of date-likes
+- `#143 <https://github.com/casact/chainladder-python/issues/143>`__ - Reworked ``full_triangle_`` run-off for expected loss methods.
+
+
 Version 0.8.2
 --------------
 Release Date: Mar 27, 2021