Added release notes for 3.1.0 [ci skip]

docs/releasenotes/3.1.0.rst

@@ -0,0 +1,23 @@
+
+3.1.0
+=====
+
+ImageDraw arc, chord and pieslice can now use floats
+----------------------------------------------------
+
+There is no longer a need to ensure that the start and end arguments for `arc`,
+`chord` and `pieslice` are integers.
+
+Note that these numbers are not simply rounded internally, but are actually
+utilised in the drawing process.
+
+Consistent multiline text spacing
+---------------------------------
+
+When using the ImageDraw multiline methods, the spacing between lines was
+inconsistent, based on the combination on ascenders and descenders.
+
+This has now been fixed, so that lines are offset by their baselines, not the
+absolute height of each line.
+
+There is also now a default spacing of 4px between lines.

docs/releasenotes/index.rst

@@ -6,6 +6,7 @@ Release Notes
 .. toctree::
   :maxdepth: 2
 
+  3.1.0
   3.0.0
   2.8.0
   2.7.0