chore: fix typo on changelog

Author: andreynering

CHANGELOG.md

@@ -12,7 +12,7 @@
 - Expose a new `TASK_DIR` special variable, which will contain the absolute path
   of task directory. (#1959, #1961 by @vmaerten).
 - Fixed fatal bugs that caused concurrent map writes (#1605, #1972, #1974 by
-  @pd93, @GrahamDennis and @trim21.
+  @pd93, @GrahamDennis and @trim21).
 - Refactored internal ordered map implementation to use
   [github.com/elliotchance/orderedmap](https://github.com/elliotchance/orderedmap)
   (#1797 by @pd93).