Fix markdown syntax of Kalamuna link

Author: RobLoach

README.txt

@@ -1,5 +1,5 @@
 # Attention fellow Kalathemers
-Due to changing priorities and workflows here at [Kalamuna(https://www.kalamuna.com) Kalatheme will no longer be developed.
+Due to changing priorities and workflows here at [Kalamuna](https://www.kalamuna.com) Kalatheme will no longer be developed.
 There will not be a Drupal 8 version of Kalatheme as we have switched to a more
 bespoke approach that utilizes [Paragraphs](https://www.drupal.org/project/paragraphs) and [Kalastatic](https://github.com/kalamuna/kalastatic). We are still developing a base theme called [Kalabase](https://github.com/kalamuna/kalabase) however it will likely remain rather opiniated and not super useful to others.