Update changelog and bump version (#18)

CHANGELOG.md

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5fefb4e..ab380fb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+### 2.0.7
+
+* Remove `set exitCode` instances
+
 ### 2.0.6
 
 * Fix SDK constraint.

pubspec.yaml

diff --git a/pubspec.yaml b/pubspec.yaml
index 672ae2b..cd2d2a6 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: process
-version: 2.0.6
+version: 2.0.7
 authors:
 - Todd Volkert <tvolkert@google.com>
 - Michael Goderbauer <goderbauer@google.com>