Update pubspec description to have the recommended length
diff --git a/pubspec.yaml b/pubspec.yaml
index 51706f6..c910d0c 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,10 +1,8 @@
 name: charcode
 version: 1.1.3-dev
 description: >-
-  Constants for ASCII and common non-ASCII character codes.
-  When working with characters in Dart, there is no simple way to
-  represent the code point of a character.
-  This library declares readable symbolic names for character codes.
+  Constants for ASCII and common non-ASCII character codes represented by
+  top-level constants.
 homepage: https://github.com/dart-lang/charcode
 
 environment: