typo fix in CHANGELOG

Author: samrocketman

CHANGELOG.md

@@ -6,7 +6,7 @@ Important Notes:
   configuration files are now created separately from your git config.  The
   configuration files are named `~/.gitconfig_idm_<identity>`.
 - Due to the new feature identity directory tracking, identity names now must be
-  a limited set of characters.  Only uppoercase, lowercase, underscore, and
+  a limited set of characters.  Only uppercase, lowercase, underscore, and
   hyphen are valid characters in an identity name.
 - Minimum recommended git version is raised from 2.10 to 2.13.  This is to
   support the new feature identity directory tracking.