Prepare to release 1.5.2 (#118)

diff --git a/pubspec.yaml b/pubspec.yaml
index e400bd4..9924b24 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,10 +1,10 @@
 name: args
-version: 1.5.2-dev
+version: 1.5.2
 author: "Dart Team <misc@dartlang.org>"
 homepage: https://github.com/dart-lang/args
-description: >
- Library for defining parsers for parsing raw command-line arguments into
- a set of options and values using GNU and POSIX style options.
+description: >-
+ Library for defining parsers for parsing raw command-line arguments into a set
+ of options and values using GNU and POSIX style options.
 
 environment:
   sdk: '>=2.0.0 <3.0.0'