Prepare to publish (#70)

- Merge 2 recent `-dev` changelog sections into one.
- Drop the `-dev` in the version.
- Minor cleanup in the changelog. Use present tense and format with
  periods at the end of sentences.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d64052b..c9e562a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,10 +1,7 @@
-## 1.9.5-dev
+## 1.9.4
 
-* ability to parse chrome eval exceptions
-
-## 1.9.4-dev
-
-* Added support for firefox anonymous stack traces
+* Add support for firefox anonymous stack traces.
+* Add support for chrome eval stack traces without a column.
 * Change the argument type to `Chain.capture` from `Function(dynamic, Chain)` to
   `Function(Object, Chain)`. Existing functions which take `dynamic` are still
   fine, but new uses can have a safer type.
diff --git a/pubspec.yaml b/pubspec.yaml
index 6f0b89e..6eeb645 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: stack_trace
-version: 1.9.5-dev
+version: 1.9.4
 
 description: A package for manipulating stack traces and printing them readably.
 homepage: https://github.com/dart-lang/stack_trace