Fix version syntax

NeoTeo · NeoTeo · commit f4aa5827dea5 · 2015-12-16T13:57:55.000+01:00
diff --git a/Cartfile b/Cartfile
@@ -1 +1 @@
-github "NeoTeo/SwiftMultiaddr" "experiment"
+github "NeoTeo/SwiftMultiaddr" == 0.1.5

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-github "NeoTeo/SwiftMultiaddr" "experiment"`
	`1`	`+github "NeoTeo/SwiftMultiaddr" == 0.1.5`