Checking in changes prior to tagging of version 0.20.

Changelog diff is:

diff --git a/Changes b/Changes
index 07ce6ad..9c181b4 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension Perl-PrereqScanner-Lite

 {{$NEXT}}

+0.20 2014-07-31T07:59:24Z
+
+    - Bug fix (#2)
+    - Upgrade the dependency of Compiler::Lexer
+
 0.19 2014-07-17T01:37:16Z

     - Bug fix (#3)