Update CHANGELOG for release (#42)

Author: Tim Kutcher

CHANGELOG.rst

@@ -3,6 +3,14 @@ CHANGELOG
 ==========
 
 
+`0.3.0`_ (2021-6-15)
+---------------------
+
+* Fix the formula strings in output ``model-generate`` files (`#38`_) [Credit: `@mklaber`_]
+* Add ``--include``/``-i`` options to ``model-generate`` (`#40`_) [Credit: `@mklaber`_]
+* Contributing documentation updates (`#41`_)
+
+
 `0.2.0`_ (2021-4-14)
 ---------------------
 
@@ -28,6 +36,7 @@ CHANGELOG
 
 .. _`0.1.0`: https://github.com/tkutcher/quickbase-client/releases/tag/v0.1.0
 .. _`0.2.0`: https://github.com/tkutcher/quickbase-client/releases/tag/v0.2.0
+.. _`0.3.0`: https://github.com/tkutcher/quickbase-client/releases/tag/v0.3.0
 
 
 ..
@@ -36,5 +45,15 @@ CHANGELOG
 
 .. _`#28`: https://github.com/tkutcher/quickbase-client/issues/28
 .. _`#34`: https://github.com/tkutcher/quickbase-client/issues/34
+.. _`#38`: https://github.com/tkutcher/quickbase-client/issues/38
+.. _`#40`: https://github.com/tkutcher/quickbase-client/issues/40
+.. _`#41`: https://github.com/tkutcher/quickbase-client/issues/41
+
+
+..
+   Contributors
+
+
+.. _`@mklaber`: https://github.com/mklaber