docs: typo

Author: tony

doc/developing.rst

@@ -233,7 +233,7 @@ Travis CI
 tmuxp uses `travis-ci`_ for continuous integration / automatic unit
 testing.
 
-tmuxp is tested against tmux 1.8 and the latest git source. Tnterpretters
+tmuxp is tested against tmux 1.8 and the latest git source. Interpretters
 tested are 2.6, 2.7 and 3.3. The `travis build site`_ uses this
 `.travis.yml`_ configuration: