Updated package:file dependency to version 2.0.1 (#5)

This requires bumping our version to 2.0.0 since we expose
FileSystem references in our API, and the Filesystem API
version changed in version 2.0.0
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f16fa65..9db945d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+#### 2.0.0
+
+* Bumped `package:file` dependency to 2.0.1
+
 #### 1.1.0
 
 * Added support to transparently find the right executable under Windows.
diff --git a/pubspec.yaml b/pubspec.yaml
index b3fba70..debb5a7 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: process
-version: 1.1.0
+version: 2.0.0
 authors:
 - Todd Volkert <tvolkert@google.com>
 - Michael Goderbauer <goderbauer@google.com>
@@ -7,7 +7,7 @@
 homepage: https://github.com/google/process.dart
 
 dependencies:
-  file: ^1.0.1
+  file: ^2.0.1
   intl: '>=0.14.0 <0.15.0'
   meta: ^1.0.4
   path: ^1.4.0