Merge pull request #203 from ebriney/bump_to_v0.6.4

Bump to 0.6.4
diff --git a/credentials/version.go b/credentials/version.go
index c2cc3e2..185e367 100644
--- a/credentials/version.go
+++ b/credentials/version.go
@@ -1,4 +1,4 @@
 package credentials
 
 // Version holds a string describing the current version
-const Version = "0.6.3"
+const Version = "0.6.4"