Merge pull request #66 from n4ss/release-v0.5.1

Update version tag to v0.5.1
diff --git a/Makefile b/Makefile
index b310b10..8f3ea64 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 .PHONY: all deps osxkeychain secretservice test validate wincred
 
 TRAVIS_OS_NAME ?= linux
-VERSION = 0.5.0
+VERSION = 0.5.1
 
 all: test