Update README.md

Added GoDoc status

README.md

diff --git a/README.md b/README.md
index f232fbb..672c4a0 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@
 Documentation
 -------------
 
-See http://godoc.org/github.com/magiconair/goproperties
+See [![GoDoc](https://godoc.org/github.com/magiconair/goproperties?status.png)](https://godoc.org/github.com/magiconair/goproperties)
 
 
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