bump version, add changelog

docs/CHANGELOG.md

@@ -0,0 +1,6 @@
+# Changelog
+
+## 0.12 - 06/30/2013
+- IMPROVEMENT Improved developer documentation
+- IMPROVEMENT Simplified build process with custom version of go-bindata that compiles assets into binary releases
+- BUGFIX Github issue #4: Raw/Binary requests bodies are no longer truncated at 8192 bytes.

src/ngrok/version/version.go

@@ -7,7 +7,7 @@ import (
 const (
 	Proto = "1"
 	Major = "0"
-	Minor = "11"
+	Minor = "12"
 )
 
 func MajorMinor() string {