Release 0.12.11 (#179)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index db929a4..cc527d1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## 0.12.11-dev
+## 0.12.11
 
 * Change many argument types from `dynamic` to `Object?`.
 * Fix `stringContainsInOrder` to account for repetitions and empty strings.
diff --git a/pubspec.yaml b/pubspec.yaml
index eb580cd..7123e28 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: matcher
-version: 0.12.11-dev
+version: 0.12.11
 
 description: >-
   Support for specifying test expectations via an extensible Matcher class.