fix: correct typo to spell "convention"

Fixes #70.

Author: modlin

README.rst

@@ -49,7 +49,7 @@ and communicating it (using the cli provided by commitizen).
 The reasoning behind it is that is easier to read, and enforces writing
 descriptive commits.
 
-Besides that, having a convetion on your commits, makes it possible to
+Besides that, having a convention on your commits, makes it possible to
 parse them and use them for something else, like generating automatically
 the version or a changelog.
 
@@ -179,4 +179,4 @@ Feel free to create a PR.
 4. Run :code:`./scripts/test`
 
 
-.. _conventional commits: https://conventionalcommits.org/
+.. _conventional commits: https://conventionalcommits.org/